any of a class of solid or semisolid viscous substances obtained either as exudations from certain plants or prepared by polymerization of simple molecules
造句
Acrylics may also be modified with other resins. 丙烯酸也可以被其它樹脂改性。
The resins were used to turn out millions of helmet liners. 用這類樹脂生產了成百萬只鋼盔內襯。