Listening

Mysteries of Nature 1 

There are many mysteries(奥秘) in nature.

Mysteries are things we don't understand, such as how the Egyptian pyramids(埃及金字塔) were built. 

In fact, we are surrounded by mysteries.

What we know about the world seems like very little.

Scientists tell us that what we see in the universe is only a small part of what is there. 

The rest is invisible(无形), including dark matter and dark energy.

These two unknowns make up around 95% of the universe.

Evidence for their existence comes from their effects on what we can observe, such as the motion(运动) and positions of distant galaxies(星系).

Yet, though we know very little, we are able to build airplanes and communicate with smartphones. 

In some ways we humans are very smart, or at least we think we are.

We still need to face big issues, like climate change, and that is going to be a huge challenge. 

The challenge for humans will be our ability to adapt to our changing environment.

What about other forms of life? 

How do they adapt?

Seasonal variations, for example, can be one of the greatest challenges for animals to overcome. 

Overcoming such challenges is a great achievement, but hardly easy.

Some birds migrate thousands of kilometers each year to deal with seasonal changes. 

These migrations are amazing.

Birds don't carry maps or compasses, yet they know where to go. 

They have developed the ability to see the Earth's magnetic(磁性) field. 

This ability is a wonder of nature.

It takes advantage of the fact that the earth is like a huge bar magnet.

It has a north pole, which is positive, and a south pole, which is negative.

Somehow the birds are able to see this magnetic field and use it to their advantage.

And even the way birds fly together is amazing. 

Many migrating birds fly in a V formation.

They do this to conserve energy.

In a V formation, birds can use the energy of the birds in front of them. 

This energy comes from the air currents(气流) generated by the wings.

Conserving energy is necessary for the birds to survive the long journey.

How do the birds know this?

It's truly amazing how the birds know this.

Mysteries of Nature 2 

Another amazing example of survival is the salmon(三文鱼).

Salmon spend most of their lives in the ocean, which is saltwater. 

Yet when it's time to breed(配种), they do so in freshwater rivers.

Salmon can adapt their bodies to survive in both saltwater and freshwater.

When it's breeding time, they return to the same river where they were born.

It seems as if they have a built-in map that guides them for hundreds of miles.

Once they leave the saltwater, they don't eat.

They are determined to finish their journey, despite the many obstacles.

They swim against strong currents, jump over waterfalls and try to escape the claws(爪) of hungry bears. 

Many die along the way, but enough of them survive to breed and produce the next generation.

Once they have laid their eggs, they die, having completed their journey. 

It seems that their purpose in life is just to reproduce.

Migration takes animals to new, more favorable environments when the seasons change. 

Some of these journeys are long and dangerous, along routes with no obvious landmarks. 

The longest migration is that of the Arctic tern(北极燕鸥).

It flies from pole to pole, twice a year.

If a tern achieves its average lifespan of 20 years, the distance it has flown will be equivalent to a journey to the moon and back.

Humans also migrate, but seldom if ever for seasonal variations.

Unfortunately, human migrations are often due to human activities.

Since the beginning of the 21st century, large scale migrations have become a global problem. 

Millions of migrants have had to leave their countries and look for new homes.

Many have died along the way or lived as refugees(难民) in camps until they are admitted into a new country. 

So the question remains as to how our global community will face these challenges.

Vocabulary

Social Relations 

To criticize someone is to point out their faults or mistakes.

Some people appreciate constructive criticism, which can help them develop their skills.

Some people cannot take any criticism without feeling hurt.

To praise someone is to let them know that they have done a good job.

Some people expect to be praised when they have performed well.

Knowing when and how to praise someone is an important skill.

To apologize to someone is to admit that you have done something wrong or hurtful. 

One way to apologize is to say you are sorry.

If your apology isn't accepted, it means the person hasn't forgiven you.

If you accidentally hurt someone it's usually a good idea to apologize.

To order people to do something means to use your power or position to get them to do it. 

Many people dislike being ordered to do things.

In many cases it's better to make a request than order someone to do something.

If someone doesn't follow orders, he or she may be punished.

To encourage someone is to support their efforts and help build their confidence. 

A good teacher encourages students to do their best.

To discourage someone is to take away their confidence.

Some people are discouraged if they don't receive praise or recognition for their work.

Science Vocabulary 

There are many different cycles in nature, such as the cycle of seasons.

A cycle is a series of events that repeat, such as the daily cycle of light and dark.

To evolve means to change or improve over a period of time.

In biology, the theory of evolution says that advanced life forms, such as humans, has evolved from lower forms of life.

According to science we have all evolved from simple one-called organisms(生物学).

A force of attraction brings two objects closer together, such as the force of gravity.

A force of repulsion(排斥) pushes two objects away from each other, such as the force between two electrons(电子).

If two people are attracted to each other, they want to be together.

To transform means to change from one form into another.

A transformation occurs when an object takes on a new appearance or structure.

Over a period of time, the process of evolution can transform the appearance of a species of life.

To inherit something means to get it without having to ask or work for it.

A child from a very rich family may inherit a lot of money.

He inherited a large fortune when his parents died, so he doesn't have to work anymore.

A good leader can transform an unsuccessful company into a successful one by changing how it is organized.

Gravity is a force of attraction between two objects with mass.

Dialogue

Handing Office Conflicts

W：Excuse me, do you have a minute?

Boss：I'm sorry, not right now. I'll be free in about 15 minutes, could you come back then? 

W：No, I'm afraid we have an emergency upstairs.

Boss：Can't you handle it?

W：No, I think it would be best if you were there. 

Boss：OK, I'll finish this call and be right with you.

Boss：OK, what is it?

W：Kevin and Bob are shouting at each other and is upsetting everyone. 

Boss：Oh, not again. Those two have got to grow up. Who started it?

W：I'm not sure but they were even pushing each other.

Boss：OK, this is unacceptable. You run on ahead and warn them that I'm coming. I want them to calm down before I get there. Can you do that?

W：OK, I'll do what I can to calm them down. But you know Kevin, he is such a hot head.

This isn't the first time they have had problems.

Boss：OK, Kevin, I've warned you before. This is got to stop.

Kevin：Yes, I know. But Bob doesn't cooperate. He's impossible to work with.

Boss：Even so you can't go around pushing people. That's no way to handle things. If you weren't doing such a good job, I'd have to let you go right now. Your behavior just isn't acceptable.

Kevin：Yeah, I understand and I'm sorry. I just can't stand working with him.

Boss：I'm not sure what to do. What would you do if you were me? Do you have any suggestions?

Kevin：To be honest, if I were you, I wouldn't have the two of us working in the same office. I know Bob has been with the company longer than I have, but he's doing a terrible job. When you are not around he just bolies people. People are afraid of him.

Boss：OK, I'll look into a bit more. But you've got to promise me to keep cool and not let this happen again. 

Kevin：OK, I'll try to handle things differently next time.