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.

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Scientists continuously refine their theories based on new evidence.

refine 是动词,由前缀 re-(表示"再次")和 fine("精细的")组成,字面意思是"再次使之精细",引申为"精炼、改进、完善"的意思。

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