that is the main point or difficulty
那正是要点;那正是问题所在 ‘
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Is she going ?’ ‘That's just it —she can't make up her mind .’ “她去吗?”“那正是问题所在——她拿不定主意。
that is enough or the end
够了;好了
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okay ,that's it ,you've cried long enough .好了,你已经哭得够久的了。