It's two resins that are, sort of, in and of themselves -- neither of which can make glue, but when you put the two together, something happens. A bond takes place, and you get this very strong, powerful adhesive.
它其实是两种树脂，而这两种树脂 本身都是无法用来制成胶水的， 然而你要是把两者混合到一起， 它们就会发生反应。两者间形成了一个键， 最终合成了这种十分强力的 粘合剂。