Hints:
本期学习的字源：post-=after后
postmortem
单词不需要大写，单词与例句或不同词条之间换行即可。
注解中详细介绍了单词的拆分与释义，是学习字源分析的重中之重！一定记得听写后来看注解！
postpone
posterity
We must protect the environment for posterity.
postmortem
The coroner conducted a postmortem to decide the cause of death.
preposterous
No one believes his story because it's simply preposterous.
We must protect the environment for posterity.
我们得为后代保护好我们的环境。
The coroner conducted a postmortem to decide the cause of death.
法医进行验尸以判定死因。
No one believes his story because it's simply preposterous.
他的故事太荒谬了，根本没有人相信。
