distance / mental distance, psychological gap

bacteriologist

archaeologist

One should be able to derive new understanding while revising what he has learned. Learning from the past.

On things that are past, it is needless to pursue past mistakes; let bygones be bygones.

compulsory, forcing, forced, coercive, forcible

philosopher

certain, inevitable, necessary

public profit corporation

(dated slang) a woman who is attractive from behind, usually in reference to her buttocks. / (dated slang, in particular) butterface: A woman who is attractive from behind but ugly from the front.