The phrase "certain kinds" refers to specific types or categories of things or people. It indicates a particular selection or group within a broader range of possibilities. Full definition
When you really think about it, what is wrong with that caters to the specific needs of certain kinds of people? (adultdatingwebsite.com.au)
First off, let me say that asking the Big Question, worrying with some consistency about the meaning of life and final ends is only for certain kinds of people. (religion-online.org)
This process was only present in certain kind of cancer cells and therefore could be used to achieve cancer specificity. (lindau-nobel.org)