He could hear someone moving around in the room above.
他能听到楼上屋里有人走动。
约翰在楼上的房间里。
He listened; it was a footstep pacing back and forth, as though some one were walking in the room above him.
好象有人在他上面屋子里走路,是来回走动的步履声。
We use a liquid helium. And so in order to make a liquid helium, you can't take helium at room temperature and do this, because if you did, you would just heat it up, because the room temperature is above the inversion temperature, so Joule-Thomson would heat up the helium.
为了得到液氦,不能再常温,做这个实验,否则就是加热氦气,因为室温高于它的转变温度,所以焦耳-汤姆孙,实验会加热氦气。
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