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... The following week, I almost dropped a large metal ball bearing onto it, which would have shattered it. Daytona uses bushings instead of the ball bearing pivots of the upper-tier Campagnolo shifters, which allow for lighter control feel. 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.... If you shake the can, the rattling ball bearing helps to mix up the propellant and the product, so the product is pushed out in a fine mist. I have never been able to significantly magnetize a ball bearing, so I'd guess that they are usually made of a rather ‘soft’ (low carbon) steel.
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