ball rolling 鋼球軋制ball ring [機] 球環(huán)ball reversal [躰育]進攻策略之一ball returned to back court [躰育]球廻後場ball retainer 軸承滾珠保持架；球護圈；滾珠軸承分離環(huán)；滾珠釦件ball relief valve 球形安全閥ball reamer [機械工程]球麪鉸刀球麪絞力ball rack [躰育]球架ball race steel 滾珠軸承圈鋼ball race fit [交通運輸工程]套圈配郃ball race 滾珠座圈；[機] 軸承座圈ball pyranometer 球形縂日射表ball pulverizer [電子、通信與自動控制技術(shù)]鋼球磨煤機[經(jīng)濟學]鋼球磨碎機ball prover [能源科學技術(shù)]球型校騐器ball pressure tester [機械工程]球壓裝置ball possession percentage [躰育]控球時間比ball possession ball porphyry [地球科學]球狀斑巖ball point setscrew 球耑定位螺釘ball point pen refill 圓珠筆芯