安福县人才招聘网:Revise the following sentences.Try to make them concise.

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The substance,which was discovered almost by accident,had revolutionized medicine.
怎么改,高手不要沉默啊,答后请解释一下,谢谢。

The cubstance discovered almost by accident had revolutionized medicine.

The substance discovered almost by accident had revolutionized medicine

The substance was found almost by chance, had ...