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重点讲解：
1. pile up （使）堆放；（使）堆积；（使）成堆；
Bulldozers piled up huge mounds of dirt.
推土机推积起大堆大堆的泥土。
2. due to 由于；因为；
Unfortunately, due to unforeseen circumstances, this year's show has been cancelled.
遗憾的是，由于一些意外情况，今年的演出被取消了。
3. prevent sb. from 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 rich in 富含…的；含有大量…的；
The rock is rich in mineral salts.
该岩石中富含矿盐。
v. 预防，防止
