gearless

形容词 adj.
中文释义
英 /ˈɡɪələs/    美 /ˈɡɪɹləs/

英文释义

形容词 adj.
  1. Without gears. not-comparable
    — These locomotives, which were finished in crimson lake livery with gold lining and lettering, were not considered very satisfactory, for their gearless motors, with armatures mounted directly on the axles, set up considerable vibration.

词源

From gear + -less.
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