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黑火药 hēihuǒyào
eng.geol. gunpowder
met. black powder
tech. brown powder
黑火药我国古代四大发明之一，它通常指由硝酸钾、硫磺和木炭混合而成的烟火药 hēihuǒyào
expl. black powder
黑 火药
: 16 phrases in 6 subjects
Agriculture1
Aviation1
Explosives and Explosive Ordnance Disposal9
Geophysics1
Space1
Technology3

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