hemiconcentic

例句：

1. 1. The hemisphere is thelargest and most populous region of theworld.
   半球是世界上面积最大、人口最多的地区。
2. 2. Hemispheres are divided intotwo main groups: North America and SouthAmerica.
   半球分为两个主要组别：北美洲和南美洲。
3. 3. The hemispheresare responsible for producing much of the world's oil and gas.
   半球负责生产世界大部分的石油和天然气。