preconceived ideas

名词 preconceived idea:

1. an opinion formed beforehand without adequate evidence
   同义词：preconception, prepossession, parti pris, preconceived opinion, preconceived idea, preconceived notion

1. Tourists forget their preconceived ideas as soon as they visit our country.
   游客访问了我国之後立刻消除了他们的先入之见。