ballrace

名词 n.
中文释义

英文释义

名词 n.
  1. A ring with a groove in which rolling elements (such as balls) ride, forming part of a rolling-element bearing (for example, a ball bearing).
    — Home-made scooters could be special affairs made in carpenters' shops, or they could be made by boys with two rough-hewn pieces of wood put together with ball-races for the wheels.

词形变化

ballraces plural

词源

From ball + race.
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