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base ignition
avia. 弹底点火 (从弹底点火的信号弹与烟火信号弹,引燃后逐渐喷出烟幕或化学制剂)
space 弹底引燃; 弹底点火
base ignition
: 4 phrases in 2 subjects
Explosives and Explosive Ordnance Disposal1
Space3