semicircles是什么意思？

semicircles

• n. 半圆形，半圆形的周长，半圆形的东西( semicircle的名词复数 )；

柯林斯高阶英汉双解学习词典释义

• N-COUNT
  半圆;半圆弧;半圆形
  A semi-circle is one half of a circle, or something having the shape of half a circle.
  例句
  They stood in a semi-circle round the teacher's chair and answered questions. 他们围着老师的椅子站成半圆形回答问题。