柯林斯詞典mountain bike (mountain bikes) 1. N-COUNT A mountain bike is a type of bicycle that is suitable for riding over rough ground. It has a strong frame and thick tyres. 山地車 返回 mountain bike劍橋詞典a bicycle with thick tyres and a lot of gears , originally made for riding on hills and rough ground , but now often used on roads 越野自行車，山地自行車 返回 mountain bike