单词 | ball bearing |
释义 | ball bearing noun ![]() 1A bearing in which the parts are separated by a ring of small freely rotating metal balls which reduce friction.Typical coefficient of friction for a ball bearing is about mu = 1.5e - 3...
1.1A metal ball used in a ball bearing.She ricocheted down the street like a ball bearing in a pinball machine, feeling tiny and insignificant among the large and imposing aliens - a feeling she had never felt before, being a princess on her home planet....
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