furan mastic

例句：

1. 1.The furan mastic was used to waterproof the walls of the old building.
   香胶被用来防水旧建筑的墙壁。
2. 2.Furan mastic is a natural material that can be used in many different ways.
   香胶是一种天然材料，可以用于许多不同的方式。
3. 3. Furan mastic is also used as a binding agent in papermaking.
   香胶也用作造纸业的粘合剂。