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树胶：植物产生的黏性物质，多得自豆目豆科乔木或灌木树皮的渗出物。
Gum: In Botany, an adhesive substance of vegetable origin , mostly obtained as exudate from the Bark of trees or shrubs Belonging to the pea family .
Beck领导的科学小组发现了把这种绿色黏性物质转化为抗癌黄金药物的技术。
Beck found the trick to turning the green gunk into gold-cancer fighting gold.
这两种黏性物质主要由公路交通产生：83%的细颗粒物以及46%的氮氧化物污染。
Road transport produces most of both types of gunk: 83% of the fine particles and 46% of the nitrogen pollution.
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