![Nooneknowsforsurewhenadvertisingfirststarted.Itispossib...]( "Nooneknowsforsurewhenadvertisingfirststarted.Itispossib...")
- 问题详情：Nooneknowsforsurewhenadvertisingfirststarted.Itispossiblethatitgrewoutofthediscoverythatsomepeopledidcertainkindsofworkbetterthanothersdidthem.Thatledtotheconceptofspecialization,whichmeansthatpeoplewouldspecialize,orfocus,ondoingonespecificj...
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