单词 | ball bearing |
释义 | ball bearingBrE /ˌbɔːl ˈbeərɪŋ/ NAmE /ˌbɔːl ˈberɪŋ/ noun a ring of small metal balls used in a machine to enable the parts to turn smoothly ; one of these small metal balls 球轴承;滚珠轴承;滚珠 |
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