any of a class of solid or semisolid viscous substances obtained either as exudations from certain plants or prepared by polymerization of simple molecules
Verb:
rub rosin onto;
"rosin the violin bow"
rosin的用法和样例：
例句
用作名词 (n.)
Dry rosin is best in tropic and soft rosin in cold climate. 干的松香在热带最适用，而软的松香适用于寒冷的气候。
The world gum rosin production appeares to decline in recent years. 目前世界上脂松香生产在大多数国家出现下降趋势。
Your voice sounds like the rosin sinking into the sunlight, which is quite fresh. 你的声音如同沉在日光里的松脂,是新鲜的。
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