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blast off ['blɑ:st'ɔf]
gen.	发射; 严厉的责备; 极端的抗议; 走开〔出〕
expl.	飞行器，火箭等升空
blast-off ['blɑ:stɔf]
space	发射; 火箭、导弹起飞 (口语)

blast off: 9 phrases in 3 subjects

Electric machinery	1
Metallurgy	7
Technology	1