5. ancestor, descendant
forefather, offspring（单复数同行）
forebear 祖先 posterity 后代
the conflict between parents and their
posterity.
enviroment and these works of art are
preserved for posterity.
6. rot 腐烂
Too much candy will rot your teeth / make your teeth rot.
rot away 烂光
rotten adj. 腐烂的
one rotten apple spoils the whole barrel.
decay 腐烂，衰退，衰落
Each civilization is born, it culminates(巅峰),
and it decays.
7. beast n. 野兽
birds and beasts /fur and feather 飞禽走兽
metonymy 借代
A bald(代指秃子) slipped out of the house.
several skirts(代指女孩) of his class
The crown(代指王权) should not yield to the cross(代指神权).
8. census n. 对数量的统计，普查
the fifth national census
road traffic census
investigation (事件，案件)
The case is under investigation.
The investigation into(的) the cause of the air crash is continuing.
inquest (死因)
an inquest into (的) the death of the actor.
inquiry / enquiry (各种各样的调查都可)
on the spot / official / sampling inquiry
样本调查
