... serious physical injury；严重的身体伤害 serious wear damage；严重的磨损损坏 serrated；锯齿形的，使成锯齿形 ...
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只有那些由于经年使用 而严重受到磨损、或因任何方式损坏或损失重量的银币继续流通使用；将这些银币出口以及在黄金市场上销售也不值得。
Only those silver coins which were much worn by usage or in any other way defaced or reduced in weight remained in current use; it did not pay to export and to sell them on the bullion market.
被损坏的或严重磨损的螺纹也会引起关于密封的问题。
Damaged or badly worn threads can also cause problems with sealing.
有的防爆工具使用过后有些磨损和残缺，尤其带刃的防爆工具，或严重损坏，不应在继续使用，应及时打入废品。
Some explosion-proof tools use some wear and incomplete after, especially with the blade explosion-proof tools, or serious damage, should not continue to use, should be timely into the trash.
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