nèi jìng
意思解释：（Internal diameter）通过空心圆柱体或球体中心的直线，直线的两端点在物体的内表面上。 螺纹的最小直径。又叫“底径”
圆环状物件内缘的直径。1877年傅兰雅辑《格致汇编》第一册《西炮说略》:“其炮之内径一尺。”…
The diameter of the predestined relationship inside cirque shape thing. Is Fu Lan elegant 1877 collect does case send collection copy does prepare Chinese medicine by roasting it in a panbig gun say on the west slightly : Thin
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