Job Recruitment Website - Recruitment portal - Why are the links cited in the heat treatment forum not included now?

Why are the links cited in the heat treatment forum not included now?

Web pages use too many frames and pictures and too little text.

1. Web pages use frames: The content in frames is usually beyond the scope of search engines. Search engines don't crawl, so naturally they won't be searched.

2. Too many pictures and too little text: such websites will be considered as junk websites by search engines and will not be included.