VOA慢速英语:How Does One Find a Meteorite?

短语讲解：

1. About 70 percent of our planet is covered with water.

cover with 用…遮盖住，用…填满
例句：Drop several seeds over the surface of the pot and cover with a thin layer of vermiculite.
在花盆的土壤表面撒下数颗种子，并覆盖一层薄薄的蛭石。

2. They also think it had a mass of about 10,000 tons.

a mass of 大量的
例句：Setting to work, I buried myself under a mass of papers.
于是我就着手工作，埋头于一大堆文件之中。

3. But human beings are unable to hear them.

be unable to 不能/不会（做）…; 不克
例句：Many may now be unable to repay what they owe.
许多地方政府现在可能已无力偿还欠下的债务。

4. “For instance, the first time we had this, what was later called the Super Bolide of North Pacific, in the first few weeks all that was known was a large event in the middle of the Pacific. 

in the middle of 在…的中间
例句： It landed smack(-dab) in the middle of the carpet. 
那东西正好落在地毯的中央. 

5. The commission keeps contact with other agencies, such as the American space agency, that follow meteorites.

contact with 与…有交往[联系]
例句：Avoid close contact with birds.
避免与禽鸟有亲密接触。