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1.buff up 提高；使愉悦
I'm just trying to buff up my vocabulary.
我只是想提高自己的词汇量。
2.push comes to shove 事态严重；最后关头
When push comes to shove, you are on your own.
如果形势糟糕，你就只能靠自己了。
3.be on the fence about 对...持观望态度
They are sitting on the fence and refusing to commit themselves
他们保持中立，拒绝表态。
4.rubbing elbows with 与...交往
In fact he really enjoys getting out and rubbing elbows with us ordinary people.
事实上，他还很喜欢和我们这些普通人交往。
