Not to say you have to walk around with a grin all the time!中walk around
题目
Not to say you have to walk around with a grin all the time!中walk around
A genuine smile from within shows on the outside:you smile with your eyes and mouth.Not to say you have to walk around with a grin all the time!
真正的微笑是从内到外散发出来的：你的眼睛和嘴都在笑.这不是说你要一直咧着嘴笑!
walk around 绕.而走,
答案
本意是走在任何的地方 在这里可以不翻译 表示一个状态
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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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