He went up the stairs.
他上了楼梯。
upon 在...之上,迫近...。
It's not polite to look down upon him.
蔑视他是不礼貌的。
within 在...之内。
You must finish the work within two weeks.
你必须两周内完成这项工作。
without 没有,不,在...之外。
We can't do it better without your help.
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