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\\\"
造句
用作名詞(n.)
Dry rosin is best in tropic and soft rosin in cold climate. 干的松香在熱帶最適用，而軟的松香適用于寒冷的氣候。
The world gum rosin production appeares to decline in recent years. 目前世界上脂松香生產在大多數國家出現下降趨勢。
Your voice sounds like the rosin sinking into the sunlight, which is quite fresh. 你的聲音如同沉在日光里的松脂,是新鮮的。