1. rub rosin onto, as of violin bows. 
   用松香涂在小提琴的弦弓上。
2. Designating any of a group of polymerized thermoplastic vinyls, such as polyvinyl chloride. 
   聚乙烯基的表示一组聚合的热塑性乙烯基中任一种的，如聚氯乙烯
3. 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。
4. 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。
5. Any of various compounds containing the vinyl radical, typically highly reactive, easily polymerized, and used as basic materials for plastics. 
   含乙烯基的化合物含有乙烯基因子的化合物之一，典型地具有高度活性，易被多结构化，是用作塑料制作的基本材料

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