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Chinese ancient copper COINS have a square hole inside a circle.
中国古代铜钱的形状是外圆内方的。
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The center of circle is the position of the centre hole for positioning.
该圆周的圆心即定位的中心孔位置。
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The center of circle is the position of the centre hole for positioning.
该圆周的圆心即定位的中心孔位置。
youdao