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air raid precautions
avia. 预先空袭警报
air-raid precautions
gen. 〔民间〕防空措施
mil. 防空措施
air-raid precaution
tech. 防空 (措施)
air raid precaution
avia. 预先空袭警报措施
air raid precautions
: 3 phrases in 2 subjects
General2
Space1