mountain bike
Word family adjectivemountainedmountainousnounmountaineermountaineeringmountain ashmountain bikemountainboardermountainboardingmountain goatmountain lionmountainsidemountain
Bicycles, carts, horses
ˈmountain ˌbike noun [countableC] 
TTBa strong bicycle with a lot of gears and wide tyres, specially designed for riding up hills and on rough ground 山地（自行）车 →4 See picture on 见图 Page A9 Outdoor pursuits 户外活动Examples from the Corpus
mountain bike• A man completed all the Munros with a mountain bike.• A colourful explanatory leaflet is available from all national park outlets and most responsible mountain bike shops in the area.• Finally, the voluntary mountain bike restriction for Snowdon mentioned a couple of issues ago has been agreed between the interested parties.