Are the dark areas denser, or thicker, or both?

这些较深的地方是密度较高，或较厚，还是两者都有？

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Some animals grow thicker fur, or live in tree holes or underground to stay warm.

有些动物会长出浓密的毛发，或者居住在树洞或地下来保暖。

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A variant form of the EDAR gene is very common in East Asians and Native Americans, and is probably the reason that these populations have thicker hair than Europeans or Africans.

一个EDAR基因的变种形式在东亚人和美洲原住民中非常普遍，可能是这些人口拥有比欧洲人或非洲人更厚的头发的原因。

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Or how thicker padding in the roof liner helps keep the interior quieter than before.

FORBES: Test Drive: 2013 Nissan Altima

It can detect over 1, 000 degrees of pressure, so you can learn to make lines thicker or thinner based on how hard you press.

WSJ: Samsung's New Galaxy Note 10.1 Tablet Imitates Pen and Paper - Mossberg Review

In the Antarctic, the new findings confirm the trend of other recent studies - that the West is losing mass to the oceans whereas the ice sheet in the East is either getting thicker or remaining stable.

BBC: NEWS | Science/Nature | Polar ice sheets show net loss