重点讲解：
1. speed up
（使）（某一过程或活动）加快；
eg. This system helps speed up access times.
这个系统有助于加快存取时间。
eg. Once these difficulties were got over, the work would speed up.
一旦克服了这些困难，工作进展就快了。
2. in operation
使用；运作；
eg. There are three ski lifts in operation.
有3台滑雪缆车在运行。
eg. Part of the new plant is now in operation and remainder will be on stream later this month.
新工厂现已部分开工，其余部分在本月末将全部投产。
3. be guilty of
犯罪的；有罪的；
eg. He was sentenced to be guilty of intrusion upon my privacy.
他因侵犯我的隐私权被判有罪。
eg. The neighbor was guilty of murder.
他的邻居犯了谋杀罪。
