1. The female is generally drab, the male per contra brilliant.
   一般來說雌性是黃褐色的，而雄性是色彩鮮明的。
2. Per contra I don't ask her to forget but to remember.
   相反，我不是要她忘記，而是要她記住。

con.tra

prep.（介詞）
In contrast or opposition to; against.
相反：相對或相反；對立
adv.（副詞）
In opposition to something stated or expected; to the contrary.
相反地：與已陳述或預(yù)期的是相反；相對地

來源：
Latin contr3 [against] * see kom
Latin contr3 [against] *參見 kom