★★★★Sources of Pollution 污染来源
Waste water and carbon gases from farm animals are bad for the environment.
来自农场动物的废水和含碳气体对环境有害 77
waste(adj.) 废弃的,丢弃的,无用的 → waste water 废水,污水；carbon[化学]碳 → carbon gas 含碳气体；
Animals wastes and other chemicals flow into the ground and pollute water supplies/səˈplaɪz/. 79
动物废料和其他化学制品会流入地下，污染水源
waste (n.) 废料,废物,垃圾 → household waste(s) 家庭垃圾；industrial waste(s) 工业废料；toxic waste(s) 有毒废物；
chemical (n.) 化学制品,化合物；supply (n.) 供应；water supply 供水系统,水源；
Exhaust gases from automobiles are a major cause of air pollution and global warming.
汽车尾气是造成空气污染和全球变暖的主要原因。
exhaust gas 废气；a major cause of sth. …的主要原因 → e.g. Smoking is a major cause of lung diseases. 吸烟是导致肺部疾病的一个主要原因。
As a result, many companies are trying to produce more efficient and cleaner cars.
因此，许多公司都在努力生产更高效、能源消耗更低的环保汽车。
clean car 清洁能源汽车 → clean energy 清洁能源；
Pesticides/ˈpɛstəˌsaɪdz/ and fertilizers/ˈfɜrtəˌlaɪzərz/ are used by farmers to grow crops such as fruits and vegetables.
农药和化肥被农民用来种植农作物，比如像水果和蔬菜等作物。
-cid=to cut，to kill 去除,灭杀；pest (n.) 害虫；pesti + cid 切,杀 + e → pesticide (n.) 杀虫剂；fertilize (v.)使…肥沃,施肥；fertilizer (n.) 肥料,化肥；
be used by somebody to do something 被某人用来做某事；
These chemicals pollute water supplies when they flow into the ground or rivers.(状语从句)
当这些化学物质流入土地或者河流时就会污染水源。
Factories/ˈfæktəriz/ like this one allow harmful chemicals to get into the air or water.
像这样的工厂允许有害的化学物质进入大气或水中 87
harmful 有害的 → harmful chemicals 有害的化学物质；harmful radioaction 有害的辐射；be harmf to sth. 对…有害 → e.g. Somking is harmful to our health. 吸烟有害健康；Animals wastes are harmful to the environment. 动物废料对环境有害.
allow sb. to do sth 允许…做…→ e.g. My parents don't allow me to stay out late. = I'm not allowed to stay out late. 我的父母不允许我在外面待到很晚
allow doing 允许 → e.g. We don't allow smoking on the train. = Smoking is not allowed on the train. 火车上不准吸烟
Companies need to try harder to protect the environment and our health.
企业需要更加努力地保护环境和我们的健康。76
try harder to do sth. 努力做某事；
Nuclear waste products/ˈprɑdəkts/ are radioactive and can pollute the environment for thousands of years.
核废料具有放射性，可以污染环境数千年
radioaction 辐射；active 活跃的 → radioactive 放射性的,有辐射的；
They need to be safely transported andstored/stɔːrd/ in a safe place. 87
它们需要妥善的运输和储存在一个安全的地方。
transport 运输,运送,输送 → transport goods/passengers 运送货物/旅客；store 储存,储备,存放；
1.Why are many companies trying to produce more efficient and cleaner cars?
2.What do farmers use that pollute the water supplies?
3.What allows harmful chemicals to get into air or water?
4.What are used by farmers to grow crops?
跟读：Nuclear waste products need to be stored in a safe place. 77
