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。
2
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。
3
To liquid nitrogen, flesh is like that skillet-a surface hundreds of degrees above its boiling point.