n.半球
If you cut a round fruit into two, each half is a hemisphere. 如果你把一个圆的水果切成两半，每一半就是一个半球。
The Northern Hemisphere is the part of the world north of the equator, and the Southern Hemisphere is south of the equator. 北半球是地球赤道以北的部分，南半球是赤道以南的部分。
