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If traffic tails back, cars form a long slow line behind a problem: 'Traffic tailed back for five .' British — you hear it on UK radio; the noun is 'a tailback'. American news says 'back up' instead.
（車流）回堵
If traffic tails back, cars form a long slow line behind a problem: 'Traffic tailed back for five .' British — you hear it on UK radio; the noun is 'a tailback'. American news says 'back up' instead.
（車流）回堵