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词汇 ball bearing
释义
ball bearing
noun [ C ] uk/ˌbɔːl ˈbeə.rɪŋ/ us/ˌbɑːl ˈber.ɪŋ/
滚珠滚珠轴承
a small metal ball or several of these arranged in a ring to make particular parts of a machine move more easily
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