短语词组短語ball float collar 球形浮箍ball collar thrust bearing 滾珠環止推軸承;[機]滾珠環推力軸承;環形球推力軸承;滾珠環止推ball collar tbearing 油膜軸承concentrated ball collar 密珠套ball collar thblight bearing 滾珠環止推軸承 返回 ball collar