ball journal bearing球颈轴承;球颈
ball socketed bearing耳轴轴承
ball-bearing fan滚珠轴承风扇
ball-bearing滚珠轴承;球状转轴;采用小球;用小球
ball-bearing oil球轴承润滑油
ball reciprocating bearing可后移滚珠轴承
ball shaped bearing活塞头
ball-bearing cartridge球轴承座
ball thrust bearing[机] 止推滚珠轴承;推力球轴承;滚珠止推轴承;滚珠推力轴承
N-COUNT（可数名词） Ball bearings are small metal balls placed between the moving parts of a machine to make the parts move smoothly. 滚珠轴承