形容词
中文翻译：平坦的
同义词：
['straight', 'level', 'flat-bottomed', 'smooth']
例句：
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1. The floor is very flat and easy to clean.
地板非常平坦，容易清洁。
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2. The table is flat enough for a small family gathering.
桌子足够平坦，可以供一个小家庭聚会使用。
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3. The car has a flat tire on the side of the road.
汽车在路边有一个瘪了的轮胎。