半圆；圆的一半。
semicircles — plural of semicircle
半圆；圆的一半。；测量员用于测角的仪器；测角器。；以罚球点为圆心、从罚球区顶部延伸出的弧线。
半圆；圆的一半。
A half of a circle.
半圆形的平面图形
a plane figure with the shape of half a circle
测量员用于测角的仪器；测角器。
A surveyor's instrument for measuring angles; a graphometer.
以罚球点为圆心、从罚球区顶部延伸出的弧线。
An arc whose center is the penalty spot, extending from the top of the penalty area.
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