... 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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Replacement brush: brush wear should not be used to change immediately, otherwise damage the commutator, more easily cause serious electrical burn.
调换电刷：电刷磨损到不能使用时应立即调换，否则会损坏换向器，严重时更容易导致烧坏电机。
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.
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。
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