polar hemisphere

• 极半球

polar hemisphere的用法和样例：

例句

1. His politics at home were validating his efforts in the hemisphere.
   他的国内政策也有效地支持了他对本半球所做的努力。
2. One of the cerebral hemisphere is diffusely echogenic.
   胎儿一侧大脑半球弥漫回声。