pe·tard /pəˈtɑr(d)/
炸藥的一種,花火,爆竹
Pe·tard n. Mil. A case containing powder to be exploded, esp. a conical or cylindrical case of metal filled with powder and attached to a plank, to be exploded against and break down gates, barricades, drawbridges, etc. It has been superseded.
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petard
n : a explosive device used to break down a gate or wall