Black holes form when massive stars run out of nuclear fuel, collapse and become so compressed and dense that not even light can escape their gravitational pull.
当大质量的恒星耗尽了核能源、坍塌并被压缩到一个紧密和密度达到连光线也逃脱不了它们的引力的时候,黑洞便产生了。
And she said, It was 11 So, as you get all the things compressed, right?
她答道,是11年前1,所以,要等你把所有的东西都压缩精炼,对吗?
Compressed-air plants are inefficient, and so they are commercially viable only in places where the price of power varies dramatically.
压缩空气发电站效率不高,因此它只有在电价波动大的地方才具有商业可行性。
But then next time it will be a two-hour movie, Citizen Kane so that the course is very compressed.
下次课会是一部两小时的电影,《公民凯恩》,所以上课时间很紧。
So I've got, this piston here is compressed, and I slowly, slowly increase the volume, drop the temperature.
这样,这个活塞就被压缩了,然后我再很慢很慢地增加它的体积,降低温度。
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