hemisphere

剑桥词典

one of two halves of the earth , especially above or below the equator
（尤指地球的）半球
the northern /southern hemisphere 北／南半球
anatomy   specialized
one of the two halves of the brain
脑半球
the left /right hemisphere 左／右脑半球

half of a sphere (= ball shape )
球体的一半
The bush had been pruned into a perfect hemisphere. 树丛被修剪成了一个完美的半球。 返回 hemisphere