后辈的英文：
posterity

In the future, the Central Committee will have younger and younger members, so they will be even more junior to us.
以后中央委员会的成员越来越年轻，越来越是我们的后辈。

Plaster a wall with posters = plaster posters on a wall
贴海报于墙上

There is a poster about the pop festival.
有一张关于流行音乐节的海报。

Bill posters will be prosecuted.
张贴广告的人将被起诉。

I have an original movie poster.
我有一张原版电影海报。

Won't the big-character poster be handed down to posterity?
这个大字报不传下去呀？