名词
中文翻译：半圆
同义词：
['semi-ellipse', 'semi-arc']
例句：
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1.The teacher drew a semi-circle on the blackboard.
老师在黑板上画了一个半圆。
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2.The moon is often depicted as a semi-circle in art.
月亮经常在艺术中被描绘成半圆。
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3.The car was parked in a semi-circle around the tree.
汽车停在了树周围一个半圆的位置。