The mantle's motions, analogous to those in a pot of boiling water, cool the mantle by carrying hot material to the surface and returning cooler material to the depths.

地幔的运动类似于一壶沸水的运动，它把热的物质带到表面，再把较冷的物质带到深处，从而使地幔冷却。

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With the high temperatures, there must be sufficient cloud cover to keep any water on the surface from boiling.

由于温度较高，必须有足够的云彩才能防止星球表面的水分不会出现沸腾。

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As the fat renders, the tallow will float to the surface of the boiling water.

脂肪提炼后，动物脂就漂在沸水表面。

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The Old Trafford side were rattled and Rio Ferdinand kicked the ball into the crowd and hit a spectator when the referee did not play an advantage with United's frustration boiling to the surface.

BBC: SPORT | Football | Premiership | Man Utd 4-1 Blackburn