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，很容易清洁。
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2. The table is flat, so it's easy to move around.
桌子很平坦，所以移动起来很方便。
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3. The road is flat, which makes it easy for cars to drive on.
道路平坦，这使得汽车容易行驶。