Lead error would be occurred during process thread by NC lathe. Aiming at this issue, accurate thread excess was calculated. This way is simple and effectiveness in practice. 摘要用数控车床加工精密螺纹时，在开始段和结束段会出现导程误差。针对这个问题，进行了准确的螺纹裕量计算。在实际加工中，简单易行，效果良好。
It may take an hour to wind off all the thread. 把所有线都松下需一个小时。
The thread seems to match the cloth. 这线和这布似乎很相称。
How many spools of thread did you use? 你用了几轴线?
The sale department makes an accurate forecast of sale. 销售部门做了一项准确的销售预测。