二十年多前，我是一名牙科医生，在中国南方的一个小镇上手握钢钳，每天拨牙长达八个小时。
Yu HuaTwenty years ago, I was a dentist in a little town in southern China. Forceps in hand, I extracted teeth for up to eight hours a day.
用宽吊带吊装涂塑管件，不允许使用链条，钢索，钢钳或者其他破坏涂层的吊装工具，不能拖拉滚动钢管。
Coated articles shall be hoisted using wide-belt slings. Chains, cables, tongs, or other equipment that causes damage to the coating will not be permitted, nor will dragging or skidding of the pipe.
结果表明，海绵钳表面产生黑斑是在油炉加热过程中，加热油燃烧不充分所形成的炭黑滴落聚结在钢表面所致；
The results show that the surface blacks are caused by oil incomplete combustion during heating process in oil-furnace which results in aggregated sooting on the surface of steel parts;
结果表明，海绵钳表面产生黑斑是在油炉加热过程中，加热油燃烧不充分所形成的炭黑滴落聚结在钢表面所致；
The results show that the surface blacks are caused by oil incomplete combustion during heating process in oil-furnace which results in aggregated sooting on the surface of steel parts;
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