No, not what I meant. If you start out witha high quality source and use a compression technology to produce a small file, you throw away source material. This applies to MP3s just as it does to jpeg files for photos, and it's a destructive edit. Once you've thrown the data away, you cannot unthrow it .... or not accurately anyway.
Here's another (somewhat forced) analogy.
Suppose you start out with three eggs, and make an omelette. You crack the eggs, add salt, pepper and a little milk, then you throw away a third of the mixture. Then you fry it, and serve it on a plate, only to be told "I've changed my mind, I'd like boiled eggs, please".
If you start out with eggs, you can end up with boiled, fried, scrambled, omelette, or even eggs benedict. If you start out with an omelette, you've got an omelette, period.
Yes, you can put MP3 files on a CD, and you can even burn the CD in a format that makes it play like a CD, but the quality will always be that of the MP3 file, at best, and that quality on, erm, the skill of the chef, and the recipe he/she used to cook the MP3.
Note: Before anyone says it, yes, I'm aware some MP3 files are very high quality, but many are not, and through a good hifi and to someone with a decent ear, there's nearly always a msrked difference. And yes, I'm also aware that not all CD's are born equal either, and some are utter junk, in audio quality terms.