Based on the analysis of tapping force system and characteristic of chip removal, it is confirmed that radial force, axial force and jam of chip removal are the main reasons for poor thread quality.

通过对攻丝切削力和丝锥排屑特点的分析，确定径向力、轴向力和排屑不畅是影响攻丝质量的主要因素。

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My grandmother has poor eyesight and has to use a magnifying glass to thread her needles.

奶奶眼花了，认针的时候总要拿个放大镜。

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His England career looked to be hanging by a thread when he was dropped after a poor showing in Bangladesh in the winter.

BBC: SPORT | Cricket | England | Harmison joy at hat-trick