vt. 精炼, 净化, 使优雅, 使精炼

vi. 被精炼, 被净化

v. treat or prepare so as to put in a usable condition

v. reduce to a fine, unmixed, or pure state; separate from extraneous matter or cleanse from impurities

v. attenuate or reduce in vigor, strength, or validity by polishing or purifying

v. make more precise or increase the discriminatory powers of