Line the base of each pot with some of these fragments - they let water drain out the hole in the base without carrying away the soil.
把这些碎片中的部分在每个壶的底部排好-它们可以不带走土壤而让水流干。
The gas will swirl around the black hole like water circling a drain.
黑洞周围的气体会如同水池排水时候的水一样形成漩涡状。
The drain was a big black hole, and the water went through it very fast, making a loud noise.
这个排水管是一个大黑洞，水在排水管中湍急地流过，发出很大的声响。
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