重点讲解：
1. screw up
弄糟；搞乱；毁坏；
eg. You can't open the window because it screws up the air conditioning.
你不能打开窗户，那样空调就不起作用了。
eg. Get out. Haven't you screwed things up enough already!
滚出去。事情给你搞得还不够糟啊！
eg. Somebody had screwed up; they weren't there.
有人把事情搞砸了；他们没在那里。
2. be of value
有用的；重要的；
eg. He is a man who is of value to the people.
他是一个有益于人民的人。
eg. This weekend course will be of value to everyone interested in the Pilgrim Route.
这一周末课程对每一个对朝圣路线感兴趣的人来说都会很有用。
eg. If you can provide something of value, people will be more than happy to pay for your contribution.
假如你能够提供一些有价值的事物，人们将很乐意为你所做的贡献买单。
3. be capable of
有…能力的；能够…的；
eg. He appeared hardly capable of conducting a coherent conversation.
他好像连话都说不清楚。
eg. The kitchen is capable of catering for several hundred people.
厨房能同时容纳数百人进餐。
eg. I had no hesitation in calling the police because I realised he was capable of murder.
我意识到他可能要杀人，所以就毫不犹豫地报了警。