I'm dreadfully afraid of being tempted, at an unguarded moment, by the aunt'.

我非常害怕在一个毫无防备的时刻被阿姨诱惑。

I almost regretted having uttered this last word, which dropped from me in an unguarded moment.

我几乎后悔说出了这最后一句话， 这句话在我不经意间脱口而出。

Yes, he was coarse, he was tricky, he was unsafe to have dealings with, and you never could tell when the dull weapon you put into his hands in an unguarded moment might turn into the keenest of blades.

是的，他很粗鲁，又很狡猾，他不是一个你能放心跟他打交道的人。你永远也说不准你放在他手里的那把钝刀子，什么时候稍不防备就会变成最锋利的武器。

Accident again united us; I could not refuse myself the melancholy pleasure of mingling my tears with his: We met nightly in the Gardens of St. Clare, and in an unguarded moment I violated my vows of Chastity.

事故再次将我们团结在一起；我无法拒绝自己的眼泪和他的眼泪混合在一起的忧郁乐趣：我们每晚在圣克莱尔花园见面，在一个毫无防备的时刻，我违背了我的贞操誓言。