(1) 时间段 + later:常用于过去,表示「稍后、……之后」
A few minutes later, the boss came in with my bag.
later 也可以单独用,表示「从现在开始的以后」
I will tell you later. 我以后会告诉你的。
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(2)after+时间点、时间段都可以, 多用于过去
After 2 o’clock, they started to climb.
After so many years in the US, he has changed a lot.
You mustn’t come home after 10:30.
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(3)after 可以引导从句,later 不能。
After she had mixed flour with water, the children came home.
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