1. in the mass : 总体上;
2. be a mass of : 遍布着;
形容词
1. Dark clouds massed, and we expected rain.
乌云密集,我们企盼下雨。
名词
1. A liter of gas has less mass than a liter of water.
一公升汽油的质量比一公升水的质量小。
2. Before the rain, the sky was a mass of clouds.
下雨前,天空有一团云。
3. I've masses of work to do.
我有许许多多的工作要做。