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on in至at
1、at in on───在
2、on at in───在中打开
3、on at───在
4、on in at───在…上
5、in on───参加,参与;参与,参加
6、in on at───在
7、in on at for───参加
8、on at in weekend───在周末
9、in at on───在上的
1、I'm terribly sorry to drop in at this time on Friday, Paul.───保罗,我非常抱歉在星期五的这个时候来拜访你。
2、Some chimpanzees, for example, are known to bang nuts on stones, in order to break the shell and get at the edible kernel inside.───例如,人们知道有些黑猩猩会把坚果砸到石头上,以便敲开坚果壳,吃到里面的的果仁。
3、Grace Murray Hopper studied mathematics and physics at Vassar College and went on to earn her Ph.D. in mathematics at Yale.───格蕾丝·默里·霍珀曾于瓦萨尔学院学习数学和物理,并在耶鲁大学继续深造获得数学博士学位。