spacing hole
... 跟踪编码经纬仪：tracking encoded theodolite 跟位孔：spacing hole 跟随调焦装置：follow focus attachment ...
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保持孔位精度跟计算机设计值尽可能接近是关键。
It also is critical to maintain the accuracy of the aperture position as close to the computer-generated design as possible.
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