However, we are actually doing much of this research for the improvement of life for humans. 然而，我们确实正在做很多这样的研究来改善人类的生活。
Oral contraceptives can be used over a long period of time to treat your acne, although it may take a few months for you to notice an improvement in your complexion. 口服避孕药可在很长一段时间来控制您的痤疮，尽管它可能需要几个月的时间来改善你的肤色。
