[化] 脂松香

gum rosin的用法和样例：

例句

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。
Gum rosin is a kind of natural resin with high economic value.松香是一种具有重大经济价值的天然树脂。

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anchor and chain proved