ball boy n. （給打網(wǎng)球的人撿球的）球童ball bond n. 球焊，球焊接頭；球形接合，球形鍵合ball below the stance [體育]球低于站位ball bearings ball bearing tube [經(jīng)濟(jì)學(xué)]滾珠軸承管ball bearing spacer [機(jī)械工程]球軸承隔離件ball bearing socket [土木建筑工程]滾珠軸承套ball bearing pulverizer [機(jī)械工程]滾珠軸承磨粉機(jī)ball bearing pad [機(jī)械工程]碰珠墊塊ball bearing outer ring [機(jī)械工程]球軸承外圈ball bearing nut [經(jīng)濟(jì)學(xué)]滾珠軸承螺母ball bearing locating snap ring [機(jī)械工程]球軸承止動(dòng)環(huán)ball bearing inner ring [機(jī)械工程]球軸承內(nèi)圈ball bearing hub [動(dòng)力與電氣工程]滾珠軸承轂ball bearing hinge [機(jī)械工程]滾珠軸承鉸鏈ball bearing guide bushing [機(jī)械工程]滾珠導(dǎo)套ball bearing fit [交通運(yùn)輸工程]球軸承配合ball bearing 滾珠，鋼球；滾珠軸承ball arm 球桿ball and socket structure [地球科學(xué)]關(guān)節(jié)構(gòu)造