polar caps

• 极冠

polar caps的用法和样例：

例句

1. 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。
2. 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。