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重点讲解：
1. in case of 以备；以防；以免；
Security forces have been put on standby in case of violence.
安全部队已处于待命状态，以防出现暴力事件。
2. back and forth 来回；往返；
He paced back and forth.
他来回踱步。
3. take over 接替；接任；接手；
Make it happen. Don't wait for someone else to take over or to offer to help you out.
动手去做，不要等着别人接手或是出手帮你解决。
4. in time 及时；不迟；
If you don't make your choice in time, you are likely to fall between two stools.
如果你不及时作出决定，就会两头落空。
