1. Their daily work is to refine crude oil. 他们每天的工作是精炼原油。
2. They refine sugar using this way. 他们用这种方法精制糖。
3. But first, they must refine its motor skills. 但首先，他们必须改善其运动技能。
英英解释
v.
1. improve or perfect by pruning or polishing
2. make more complex, intricate, or richer
3. treat or prepare so as to put in a usable condition
4. reduce to a fine, unmixed, or pure state; separate from extraneous matter or cleanse from impurities
5. attenuate or reduce in vigor, strength, or validity by polishing or purifying
6. make more precise or increase the discriminatory powers of
