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重点讲解：
1. hold up 举起；抬起；提起；
Hold it up so that we can see it.
把它举起来让我们看看。
2. figure out 想出；理解；弄清；
It took them about one month to figure out how to start the equipment.
他们花了大约1个月的时间才搞清楚如何启动设备。
3. prevent sb. from sth./doing sth. 阻止；制止；阻碍；
He said this would prevent companies from creating new jobs.
他说这将使公司无法创造新的工作机会。
4. be made of （由…）构成的；（由…）制成的；
The top of the table is made of glass.
桌面由玻璃制成。
v. 预防，防止
