重点讲解：
1. ram into 猛烈撞击；使猛烈撞上另一物；
The truck rammed into a tree.
卡车撞上了一棵树dTLkEr^Ak%cCM。
2. set on fire 放火烧；使燃烧；
A post office was set on fire and vehicles were stoned by looters.
抢劫犯放火烧了一家邮局，并用石头砸车i.3hNN7H8Jms)H5。
3. a number of 许多；若干；
The research begs a number of questions.
研究绕过了一些问题)h^ACq!n!38。
4. attempt to do sth. 尝试，试图（尤指做困难的事）；
I will attempt to answer all your questions.
我将努力回答你的全部问题EUzWTC-n62%dK8GzOKME。