So if you fill your sink up, but leave the plug out, when the water level stops rising, the water in = the water out.

 
  • 比如你往洗手池里灌水卻沒(méi)把塞子塞上,當水位停止上升的時(shí)候,就可以說(shuō),流進(jìn)的水=流出的水。
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