i know of in human that is howing that effect . know of ? 为什麽KNOW 後可以加OF?

题目

i know of in human that is howing that effect . know of ? 为什麽KNOW 後可以加OF?
i know of in human that is showing that effect!.
句子更整?

答案

know of 表示只是知道而已,而know about 表示非常了解,
i know of in human that is showing that effect!.我知道正在显示（显露）那个影响（力）的人群.具体翻译要看上下文.