Stub acme thread on stem provides rapid open-close operation.

阀杆上的短梯形螺纹适用于快速启闭操作。

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To improve the performance of NC machine tool, the paper introduces the method of custom macro programming technique and simple call on transfer process of the metric system ACME screw thread.

介绍了米制梯形螺纹车削加工用户宏程序的编制和简单调用的方法，对提高数控机床的使用性能有很大的帮助，对其它非标螺纹的编程也具有一定的借鉴意义。

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The needle and the thread perform a perfect combination and manifest the Chinese esthetics "hard and soft feel" esthetics acme perfectly.

而针与线的完美演绎，恰恰最能体现中国美学“刚柔共济”的美学极致。

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