Lines 31-35: There are many other studies that should be cited here but the best route to go would be to cite the O'Neil et al. review you mention above which gives a very comprehensive overview of the current understanding of the environmental drivers of Microcystis growth and MCY production.
我的理解是这样的:这个reviewer肯定了你对O'Neil et al 引用的正确性,但有O'Neil et al还不够,要增加citation以表示你做了一个比较全面的literature review。好在O'Neil et al这篇文章是一篇很综合的文献,所以这个reviewer建议你从O'Neil et al后面的reference入手来找新的citation。