1, search engine: you can enter keywords such as "aggregate material download" in the search engine to search, and many related websites and platforms will appear. You can choose the appropriate download according to your own needs.
2. Professional material websites: Some websites specialize in downloading various types of materials, such as Pixabay, Unsplash, Pexels, etc. , and provide a large number of high-definition genuine pictures and video materials with good aggregate materials for free use and download.