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How do plumbers exist if there's no junior plumbers
(sopuli.xyz)
A place to post ridiculous posts from linkedIn.com
(Full transparency.. a mod for this sub happens to work there.. but that doesn't influence his moderation or laughter at a lot of posts.)
This might be a bit controversial, but all those fields he mentioned do have younger people learning how to do the work. Doctors spend 7 or more years doing doctor work under someone else's watch before they can strike out on their own.
You could call them junior doctors if you like
Assuming Scrubs is accurate, they are literally called junior doctors.