asphaltene fraction的用法和樣例：
例句
- Centrifuging, washing, and filtering may separate any fraction of polymer that occurred by an emulsion process.
離心，洗滌，和過(guò)濾可以分離乳液法制得的任何級分的聚合物。 - The benzene fraction from Pyramidomonas delicatula had the strongest antimicrobial activities against Pyricularia oryzae of all the elution fractions.
在各分離組分中，嬌柔塔胞藻的苯洗脫組分對稻瘟病菌的抗菌活性最強。
