形容词
中文翻译：平坦的
同义词：
['straight', 'level', 'flat']
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 car's tires are flat, so we need to change them.
汽车的轮胎是扁平的，所以我们需要换轮胎。
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3. The table is flat, so it doesn't have any corners.
桌子是平的，所以没有角落。