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Because doctors have a halo from the school stage, even if they are not very handsome, they are friends and popular with students. Internship and post-practice
Surrounded by nurses, like the top of the men in the hospital, it's easier to keep coming and going with women
Screening out suitable marriage partners, so most doctors are also selected for other conditions besides appearance.
And the environmental factors of the house engineers will not go into details
Otherwise, if a very decent mature girl graduated from a school and is willing to date and get married, the engineers will nod their heads like garlic."