The conductor kept coming to offer them hot water.
列车员不停地来为他们提供热水。
The conductor kept coming to offer them hot water and selling them magazines.
乘务员不断地来为他们提供热水、出售杂志。
If one end of an electrical conductor is heated while the other is kept cool, a small voltage is created between the two.
如果是一个电导体的一端被加热而另一端仍然是冷的，一个微小的电压就会在二者之间产生。
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