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in 时间段，表示“在...以后”
in three days 三天后， in two weeks 两周后， in 100 years 100年后
I think there will be more pollution in 50 years. 我认为50年后会有更多的污染。
对 “in 时间段” 的提问，用 how soon 多久
I will finish my homework in half an hour.
How soon will you finish your homework?
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look 相关短语
look at... 看...
look like... 看起来像/长得像...
look for 寻找
look after = take care of = care for 照顾，照看
