virgin resin的用法和样例：
例句
- Pitch resin was synthesized from benzaldehyde and heavy oil residue.
利用纯芳烃原料和重质渣油研制的沥青树脂具有优良的耐热性。 - The experimentss show that the elastic modulus of fiber-filled solidified resin is much higher than pure solidified resin, and the shrinkage of the former is less than the latter.
实验发现复合材料制作的样件的弹性模量和拉伸强度明显高于纯树脂固化样件，且其在后固化过程中的收缩量也比后者小。
