rail/reɪl/

n. one of the two steel bars that trains run on

n. [C,常~s] 铁轨，轨道：The train left the rails but nobody was injured. 火车出轨了，但没人受伤。

by rail 乘火车：He went there by rail. 他乘火车去那儿。

音组-ail/-eɪl/

fail; mail; nail; rail; sail; tail