形容词
中文翻译：平坦的
同义词：
['straight', 'level', 'flat', 'smooth']
例句：
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1. The floor is flat and easy to clean.
地板是平的，容易清洁。
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2. The table is flat and has a smooth surface.
桌子是平的，表面光滑。
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3. The roof of the house is flat and can be easily fitted with tiles.
房子的屋顶是平的，可以很容易地安装瓷砖。