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重点讲解：
1. on hold 推迟；中断；
The project is on hold until more money is available.
这项工程暂停，等到有更多的钱时再进行。
2. knock over 撞倒；
He was knocked over by a bus and broke his leg.
他被一辆公共汽车撞倒，一条腿折了。
3. be based on 以…为基础；
The selection process is based on rigorous tests of competence and experience.
选拔过程是基于对能力和经验的严格测试。
4. be unlikely to do sth. 不太可能的；未必会发生的；
As with many technological revolutions, you are unlikely to be aware of it.
就像诸多的技术革命一样，你可能不太会注意到它。
adj. 空前的，前所未有的
