プログレッシブ和英中辞典(第4版)の解説
それでこそ【×其れでこそ】
それでこそうちの子だ
That's my boy [girl]!／《米口》 Attaboy [Attagirl]!
それでこそ紳士だ
How like a gentleman!
それでこそ彼は今の名声をかち得たのだ
That was what earned him his present fame.
それでこそ大学にやったかいがある
It was precisely for this reason that I sent you to college.