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TOEFL IELTS BNC: 4613 COCA: 5253

(the length of) a straight line that reaches from one point on the edge of a round shape or object, through its centre, to a point on the opposite edge直径

The diameter measures twice the radius.直径是半径的两倍。
The pond is six feet in diameter.这个池塘的直径为6英尺。

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