Permanent: to be fixed or unchanging, the opposite of temporary.永久（性）的，永恒的，
He plans to stay there permanently.
He has decided to become a permanent resident of China.
(Humans lived as nomads until they decided to settle down and build permanent communities.)游牧部落的一员
Temporary: only lasting for a short time, the opposite of permanent.
We can only offer him a temporary position in the company.
This is not the kind of job he wants, but it's ok as something temporary, until he can find something better.
(That company places people in part-time, temporary positions.)
Definite: well defined, precise, certain, unchanging.
一定的；确切的 精确的；明确的
We can't begin the project until you give us a more definite schedule.
We can't give you a definite answer until we get more information.
(We don't know their exact location, but they are definitely in this general area.)
Obvious: easy to see, stands out.
Of the job candidates we interviewed, he was the obvious choice.
It's obvious that he can't afford to buy that house.
(From her facial expression, it was obvious that she really disliked him.)
Trivial: of little or no importance, insignificant. 无关紧要的
It's a trivial detail, so there's no need to worry about it.重要的，琐碎的；琐细的
Those problems are not trivial, so we need to find a solution.
(He thinks it's a trivial matter, but I think it's going to cause big problems if we ignore it.)
(If you do well as a temporary worker you may be hired for a permanent position.)
