N the layer of dense soft fur occurring beneath the outer coarser fur in certain mammals, such as the otter and seal 内层绒毛 (Also called undercoat)
Under our fur, we have black skin. This helps us take in the sun's heat.
毛皮之下，我们有黑色的皮肤。这有助于我们吸收太阳的热量。
His one fashion concession was that he did not wear his fur cap and instead carried a hat of pure white under his arm.
唯一一个对装扮的让步就是，他并没有戴着皮帽，而是在手臂上夹着纯白装饰的沿边帽。
But under their fur, polar bears have black skin-the better to soak in the sun's warming rays.
不过，在北极熊毛皮下的皮肤却是黑色的，这有利于吸收温暖的阳光。
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