Wait a while till it freezes and then you can walk on top of the crust.
等到结冰,你就可以在冰面上行走了。
Water expands when it freezes.
水结冰时体积膨胀。
Water becomes solid when it freezes.
水结冰时便变成固体。
Then it freezes again in the winter.
VOA: special.2009.10.27
It's one of the only compounds, there's only I think three, where the density actually goes down when it freezes.
它是我见过的,唯一一个,在降温时密度下降的化合物。
Think of anything else with the density goes down when it freezes, and think about where we would be if that wasn't the case.
想想有没有其他的物质,在降温时密度会变大,再想想如果不是这种情况,我们将会怎么样。
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