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head-on collision ['hed,ɔn kə'lɪʒ(ə)n]
auto.	车辆迎头正面碰撞
IT	冲突争用
tech.	正面冲突; 迎头撞击; 迎面碰撞; 直接碰撞; 正碰; 两船对撞; 对撞
telecom.	同呼; 同时呼叫
transp.	对头〔迎面，直接〕碰撞; 对正碰撞

head- on collision: 3 phrases in 3 subjects

Automobiles	1
Rail transport	1
Space	1