gum rosin 松香gum resin n. [林] 树胶脂gum pink rubber [经济学]肉色树胶gum olibanum gum myrrh gum lancet [医药科学]牙龈切除刀gum lac gum labdanum gum kino gum gingiva [医药科学]牙龈gum eraser 橡皮gum elemi gum elastic catheter [医药科学]橡皮导管gum elastic bougie [医药科学]弹性树胶探条gum elastic gum dammar gum copal gum confection [经济学]胶姆糖gum boot gum boil