Clarification on pipenv and virtualenv

In the Virtual Environments document (dev/virtualenvs/) we start off by learning about pipenv but then move on to the lower level virtualenv. It is a little unclear under what circumstances we would be using virtualenv? I mean, I know it can practically be used, but for folks approaching Python for the first time it can be confusing.

I'm not suggesting the virtualenv section should go away, but maybe some additional clarification would be helpful. Something along the lines of:

"pipenv wraps a lower-level virtual environment utility - virtualenv. If you want to learn about using virtualenv, read on. Otherwise you can skip to the next chapter."

Where I personally really started getting confused is under Other Notes. Without scrolling back up the page it is not clear if this section is a part of the virtualenv discussion or if it is meant to be top-level and thus applicable to both pipenv and virtualenv.

Things become murkier when we start throwing additional utilities into the mix - as someone without experience with these utilities it seems to me that together they run somewhat parallel to pipenv.

Thanks for your hard work on this guide!

dev/virtualenvs/ にある Virtual Environments ドキュメントから始め、pipenv、virtualenv、Other Notes の各セクションをまとめて読みます。pipenv と virtualenv の関係を明確にし、読者が virtualenv に関する内容をいつ省略できるかを示し、どのノートが各ユーティリティに適用されるのかを明確にします。Python を初めて読む読者が混乱せずにセクションを読み進められれば完了です。