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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。
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。
3. a number of 许多；若干；
The research begs a number of questions.
研究绕过了一些问题。
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。
n. 议事日程
