I polished for all I was worth. The trouble is that my stock of low-grade gems was surprisingly low.
入学試験に落ちないように、彼女は一生懸命に勉強した。
She studied hard in order not to fail the entrance exam.
常人なら一生かかっても無理だろうが、本気になった蓮の前では、普通のシリンダー錠と大差ない。
A normal person might spend a lifetime at it and still not succeed but faced with a determined Ren it was not greatly different from a normal cylinder lock.