The army organized teams to dig out those who were trapped and to bury the dead.
题目
The army organized teams to dig out those who were trapped and to bury the dead.
这句话转换成：The army came to help - digging out trapped people,burying the dead and rescuing miners.
请从语法角度解释为什么这里dig,bury,reacue三个词转换后要变成ing 形式,
答案
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．
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