hemisphere
noun [ C ] uk/ˈhem.ɪ.sfɪər/ us/ˈhem.ə.sfɪr/
（尤指地球的）半球
one of two halves of the earth, especially above or below the equator
the northern/southern hemisphere 北／南半球
anatomy specialized脑半球
one of the two halves of the brain
the left/right hemisphere 左／右脑半球
球体的一半
half of a sphere (= ball shape)
The bush had been pruned into a perfect hemisphere. 树丛被修剪成了一个完美的半球。