名词
中文翻译：直径
同义词：
['radius', 'circumference例句：1. The tree is about 20 meters tall and has a diameter of 3 meters.（这棵树大约有20米高，直径为3米。）']
例句：
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1. The tree is about 20 meters tall and has a diameter of 3 meters.
这棵树大约有20米高，直径为3米。
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2. The circle has a diameter of 10 feet.
这个圆的直径是10英尺。
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3. The car's wheelbase measures 1.8 meters, which is the length of its wheelbase diameter.
汽车的轴距为1.8米，这是其轴距直径的长度。