gear mechanism

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a mechanism for transmitting motion for some specific purpose (as the steering gear of a vehicle)
• Syn:
gear
• Hypernyms:
mechanism
• Hyponyms:
first gear, first, low gear, low, gearset,
high gear, high, park, reverse, reverse gear, second gear,
second, steering gear, third gear, third, transmission, transmission system