B 開頭單詞
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 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