don't judge a book by its cover

don't judge a book by its cover は人を外見で判断してはいけないと言うときの決まり文句です。2:52 don't judge a book by its cover because you might just miss a dirty cop. ペック巡査の見た目に騙されてはいけません。外見だけ見ていると彼が悪徳警官であることを見破れないからです。

Top 10 Dirty Cops from Films
https://www.youtube.com/watch?v=md2kvBLfzWo  0:18 judging a book by its cover is an age-old adage. and it wouldn't still exist unless people kept judging books!
Can Looks Predict Someone's Intelligence?
https://www.youtube.com/watch?v=WZdBEZRiTq8  0:33 it's unfair to judge the book by its cover.
Ferrell, Hart Defend 'Get Hard' After Criticism
https://www.youtube.com/watch?v=ITH0XcqwvaA  5:14 don't judge a book by its cover

参考リンク
http://bridge-english.blogspot.jp/2013/03/blog-post_223.html  見た目に騙されるなを英語でなんと言うか？
http://bridge-english.blogspot.jp/2012/01/blog-post_04.html  見た目に騙されやすいを英語でなんと言うか？
http://bridge-english.blogspot.jp/2009/09/racial-profiling.html  racial profilingとは

練習問題解答
a-3635 judge a book by its cover
b-0007 you should never judge a book by its cover