プログレッシブ和英中辞典(第4版)の解説
はんめん【反面】
彼はおとなしい反面，大胆なところがある
Though he is gentle, he also has a bold streak in him.
この町は物価が安いが，その反面公共施設に乏しい
Prices are low in this town, but on the other hand, there aren't many public facilities, either.
反面教師
a teacher by negative example; an example of what a person should not be; a negative exemplar