keep up使熬夜

例句：Don't keep the children up too late.
      别让孩子们睡得太晚。

2.So there's always the challenge of keeping up with excitement.

keep up with跟上, 不落人之后

例句：You're walking too fast. I can't keep up with you.
      你走得太快了, 我跟不上。

      We have to work hard to keep up with these excellent students.
      为了跟上那些优秀学生, 我们得努力学习了。

      They don't think they must keep up with their neighbors.
      他们认为不必和邻居比排场。
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