名词
中文翻译：外部直径
同义词：
['outer diameter', "outer wall thickness例句：1. The steel pipe's external diameter is 20 cm.（这个钢管的外部直径是20厘米。）"]
例句：
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1. The steel pipe's external diameter is 20 cm.
这个钢管的外部直径是20厘米。
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2.The new car has a larger external diameter compared to the old one.
这款新车的外部直径比旧款大。
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3.The engineer measured the external diameter of the pipe accurately.
工程师准确地测量了管道的外部直径。