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.
焊接结构在复杂和苛刻的条件下长期工作会出现裂纹、磨损或损坏，严重时甚至导致设备报废。
Weld structure may appear flaw, wear or damage when worked under the complex and rigorous condition for a long time, which eyen lead equipments into waster.
有杆泵井中的腐蚀和磨损，造成油井的井下设备损坏，严重影响油井的正常生产。
The corrosion and wear of rod pump well cause the damage of downhole equipment and seriously affect the normal production of oil well.
有杆泵井中的腐蚀和磨损，造成油井的井下设备损坏，严重影响油井的正常生产。
The corrosion and wear of rod pump well cause the damage of downhole equipment and seriously affect the normal production of oil well.
应用推荐