我们也知道，一种广泛使用的治疗青春痘的药物阿克唐丸(异维甲酸)一直与抑郁加重有关，虽然相关原因还未确定。

We also know that a widely used drug that treats acne, Accutane (isotretinoin), has been associated with an increase in depression, although no causal link has been established.

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这两种研究观点的争论还没有最终的结果，这意味着，吃油炸鱼和增加患中风的几率是否存在因果关系尚未确定。

Both studies are not trials, which means that a causal relationship between eating Fried fish and increased risk of stroke has not been established.

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干细胞是一种尚未确定成熟为何种细胞的细胞。

Stem cells are cells that have not yet decided what they want to be when they grow up.

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