refine

科学家们根据新证据不断精炼他们的理论。

Scientists continuously ___refine their theories based on new evidence.

学习古典音乐可以提升一个人的品味。

Studying classical music can ___refine one's tastes.

我们需要提纯这些金属以去除杂质。

We need to ___refine these metals to remove impurities.