The lower ends of the water filling pipe and the seed discharging pipe are fixed in the two parallel holes of the perforator, and the upper parts are connected by connecting sheets.
注水管和下籽管的下端固定在打孔器的两平行孔内，上部由联接片相联；
Holes in parallel between the degree of error will affect the quality of the meshing gears.
孔系之间的平行度误差，会影响齿轮的啮合质量。
Oblong leather-belt holes on the card frame and the card-core frame are symmetrical and parallel, and has certain radian; a back face of the card-core frame is provided with the card buckle 3.
卡框及卡芯框上的长方形皮带孔对称并且平行，且有一定的弧度，卡芯框的背面装有卡片扣3。
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