求翻译：The turbine will be arranged in a cingulum shape with row spacing of 10d and the column spacing is not smaller than 4d是什么意思？

待解决

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The turbine will be arranged in a cingulum shape with row spacing of 10d and the column spacing is not smaller than 4d

问题补充：

匿名	2013-05-23 12:26:38 涡轮将形制形排列，与 10 d 行间距和列间距不小于 4 d

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