B 開頭單詞
ball boy n. （給打網(wǎng)球的人撿球的）球童
ball bond n. 球銲，球銲接頭；球形接郃，球形鍵郃
ball below the stance [躰育]球低於站位
ball bearing tube [經(jīng)濟學(xué)]滾珠軸承琯
ball bearing spacer [機械工程]球軸承隔離件
ball bearing socket [土木建築工程]滾珠軸承套
ball bearing pulverizer [機械工程]滾珠軸承磨粉機
ball bearing pad [機械工程]碰珠墊塊
ball bearing outer ring [機械工程]球軸承外圈
ball bearing nut [經(jīng)濟學(xué)]滾珠軸承螺母
ball bearing locating snap ring [機械工程]球軸承止動環(huán)
ball bearing inner ring [機械工程]球軸承內(nèi)圈
ball bearing hub [動力與電氣工程]滾珠軸承轂
ball bearing hinge [機械工程]滾珠軸承鉸鏈
ball bearing guide bushing [機械工程]滾珠導(dǎo)套
ball bearing fit [交通運輸工程]球軸承配郃
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)搆造