If you are downloading a task:
If the files on the Internet are incomplete (you may not be able to download them completely), health is the percentage you still need on the Internet.
If there are files (such as seeds) on the Internet, the health degree is the equivalent number of files you need to download on the Internet.
If you are uploading a task:
If the files on the internet are incomplete (except yourself), health is the percentage of the total size that the existing parts on the internet can piece together;
If the internet is complete (theoretically, the downloaders can complement each other until it is complete), it is the equivalent number of copies of the total distribution (excluding themselves).