you should certainly be on your guard against thieves.be on your guard本身就是戒备防备的意思,
题目
you should certainly be on your guard against thieves.be on your guard本身就是戒备防备的意思,
为什么还要用agains他也是,防备;预防的意思
答案
you should certainly be on your guard 不能直接跟宾语.必须加against意思是防备附against意义：介词 prep.1.反对;违反The fight against inflation has been going on for almost two years.抑制通货膨胀的战斗已...
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已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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