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1·Analyse the function of the import & outport length of idle stroke in processing of screw cutting and the method to confirm the length.

分析了螺纹车削加工中，空刀导入量、空刀导出量的作用及其确定方法。

2·The maximum velocity of the slide and the ratio between working stroke and idle stroke are the important parameters for the slide of a press.

将滑块最大速度和工作行程回程比作为衡量滑块运动性能的量化指标。

3·That idle boy hasn't done a stroke of work.

那个懒孩子一点儿工作也没做。