翻译：
题目
翻译：
One day he found an old truck that was stuck in the soft, sandy soil of the melon fied. It was full of melons that someone had tried to steal before their truck got stuck.
答案
一天他发现一辆老卡车被卡在了松软、充满沙土的西瓜地里.地里面满是西瓜,有人想在他们的卡车被卡住前偷瓜!
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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