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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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