ball bearing
英 [ˌbɔːl ˈbeərɪŋ]
美 [ˌbɔːl ˈberɪŋ]
n. 滚珠轴承; 滚珠
牛津词典
noun
- 滚珠轴承；滚珠
a ring of small metal balls used in a machine to enable the parts to turn smoothly; one of these small metal balls
柯林斯词典
- （滚球轴承的）滚珠，钢球
also ball-bearing. Ball bearings are small metal balls placed between the moving parts of a machine to make the parts move smoothly.
英英释义
noun
- bearings containing small metal balls