the expect-ed event is about to happen
(盼望的事情)即将发生;即将来临
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this is it —the big sale .快了——就要大甩卖了。
this is enough or the end
够了;好了
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this is it ,I'm going .好了,我要走了。
this is the main point or difficulty
这正是要点;这正是问题所在。