He bought a thin metal plate with a hole at the centre.
他买了块中心有孔的薄金属板。
A friction plate with a hole for connecting piece of axle is superposed on the armature.
一摩擦片，叠置于衔铁上，中央具连轴块孔；
These experiments include tension experiment of a plate with a hole, vibration and turn experiment.
这些实验包括带孔板件的拉伸实验、板件的振动实验、板件的转动实验。
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