名词
中文翻译：半圆
同义词：
['semicircle', 'semicircular']
例句：
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1. The arc of the moon is a semilunation.
月亮的弧线是一个半圆。
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2. The teacher asked us to complete our work in a semilunation.
老师要求我们在一个半圆中完成作业。
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3. The car drove around the city in a semilunation.
汽车在城市中以一个半圆行驶。