两端需穿着，以避免尖锐边缘或跨线程。
The ends should be dressed as to avoid sharp edges or cross threading.
不可将电线或软管悬挂在钉子、螺栓或尖锐边缘上。
Do not hang power supply lines or hoses over nails, bolts, or sharp edges.
倒角：两个表面相交处，通过切掉尖锐边缘形成的平面。
CHAMFER: the flat surface formed by cutting away the sharp edges of two meeting surfaces.
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