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重点讲解：
1. a series of 一连串；一系列；连续；接连；
A series of technical foul-ups delayed the launch of the new product.
一系列技术问题延误了新产品的上市。
2. assist in 帮助，协助；
We are looking for people who would be willing to assist in the group's work.
我们正寻找愿意协助该团体工作的人。
3. speak for itself 不言而喻；
Her success speaks for itself.
她的成功有目共睹。
4. be charged with 指控；控告；
The three accused, aged between 19 and 20, are charged with attempted murder.
3个年龄在19到20岁之间的被告被控谋杀未遂。
n. 文件，公文，文档
vt. 记载，(用文件
