This gave me a flash of hope.

这给了我一丝希望。

There was a flash of hope and happiness in her mind, and with a sudden impulse of gaiety she did what she had very often done before—stuck the rose in her hair a little above the left ear.

她的脑海里闪过一丝希望和幸福， 突然间一阵快乐的冲动使她做了她以前经常做的事——把玫瑰插在头发上， 略高于左耳。