semi-circle

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。

柯林斯高阶英语词典

Take time to wander among Kazan Cathedral's semi circle of enormous brown columns.

花些时间漫步于喀山大教堂里巨大的棕色圆柱所围成的半圆形.

期刊摘选