1. rub rosin onto, as of violin bows. 
   用松香涂在小提琴的弦弓上。
2. a bag filled with rosin; used by baseball pitchers to improve their grip on the ball. 
   装树脂的包；帮助棒球手握紧球。
3. The rosin and tannin that can be extracted from it are sought by the chemical industry. 
   从中提取的松香和鞣酸化学工业上是很需要的。
4. joint management, joint purchase, joint sales 
   联营、联购、联销
5. joint commission of inquiry or joint committee 
   联合调查委员会或联合委员会

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