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RosvuK@5,xo.|+_t!+wW。
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HAlWX%zF]sdg。
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JKlrPjZ-jW(c6Q6Bs。
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.#KWHvb3nEgDf。