明显特征

Also, in human studies (allergy testing in dermatological clinics), our investigation has clearly demonstrated that the rosin used as reference material is oxidised.

此外，在人体试验，我们的调查已经清楚地表明，松香用作参考材料，被氧化。

This is a very bad defect in an otherwise perfect piece of work.

这是一个非常不利的错误，否则将是一件完美的工作。