众所周知，与其他岩石行星相比，水星的密度很高。

Mercury is known to have a high density in comparison with other rocky planets.

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后来，其他研究人员测量了密度差，发现了一个显著的差异。

Later, other researchers measured the density differential and found a significant difference.

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来自其他研究的证据表明，没有火灾会导致植物物种丰富性显著减少，通常还会伴随着树木密度的增加。

Evidence from other studies suggests that exclusion of fire results in markedly decreased plant-species richness, often with an increase in tree density.

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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。

麻省理工公开课 - 固态化学导论课程节选