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ball bearing

noun
🔊/ˌbɔːl ˈbeərɪŋ/
🔊/ˌbɔːl ˈberɪŋ/
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  1. 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
    Topics Engineeringc2