Since at least the 1900s, explosives manufacturers have routinely measured time to one millionth of – Chinese translation

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Since at least the 1900s, explosives manufacturers have routinely measured time to one millionth of a second for determining the detonation rate of explosives

至少从19世纪初开始、炸药制造商业已例行测量到炸药起爆速度所用时间为百万分之一秒

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