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1.react to 对……作出反应；对……反应
Someone allergic to milk is likely to react to cheese.
对牛奶过敏的人可能对奶酪也有不良反应。
2.time and again 一次又一次；一再
Time and again political parties have failed to tackle this issue.
各个政党处理这个问题时都屡屡失败。
3.ought to 理应；应然
I think I ought to get back to work.
我想我该回去工作了。
4.fall down 摔倒；倒塌
You are likely to fall down on your research project if you don't go to the experts for advice.
如果你不去向专家们请教，你的研究项目很可能夭折。
