Glue: Adhesive substance resembling gelatin, extracted from animal tissue, particularly hides and bones, or from fish, casein (milk protein), or vegetables.
动物胶：从动物或鱼的皮、骨、酪蛋白中提炼出来的明胶状黏结剂。
2
An exceptionally clear adhesive can be made from fish and was the first adhesive used for photographic emulsions for photo film and photo resist coatings for photoengraving processes.