单词：polar caps
polar caps的用法和样例：
例句
- Yet another tipping point could come as ice sheets shrink and the polar caps start absorbing rather than reflecting energy from the sun.然而另一个引爆点的出现，则可能是冰原的缩减，极冠转反射太阳的能量为吸收。
- Observations from Earth and the Hubble Space Telescope show that Pluto has a highly reflective surface with distinct markings that indicate the presence of expansive polar caps.从地球与哈伯太空望远镜可以看到冥王星表面的反射性很强，还有很显著的斑纹，显示有广阔的极冠。
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