Silent gaps

An audio file has a lot of silent gaps that look like straight lines as shown. What are these? Thank you.

MacOS High Sierra v.10.13.5 (17F77); Audacity v.2.2.2

skips, a/k/a dropouts, see …

Thank you. Is this link also for help with the audio file if it was imported from a CD?

I’ve never used a Mac to import tracks from a CD, apparently it’s easier than on Windows, see …
https: //