他不在办公室里.Translate it into English
题目
他不在办公室里.Translate it into English
Please provide a better answer and explain in mandarin.
Please tell me the difference among (1) ,(2),and (3).
1)he is out of office
2)he is outside of office
3)he is not in office
答案
3)he is not in office
举一反三
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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