He would fain give up everything he has now.

他宁愿放弃他现在拥有的一切。

I fain accepted the challenge of the young man.

我欣然接受了那位年轻人的挑战。

I'll be fain to help you with this.

我很乐意帮你这个忙。

Could I exchange my nature with any other creature, I fain would be such a happy little lark!

如果我变成其他动物，我愿意做一只快乐的小云雀！

I would fain do as you ask.

听候你的吩咐。

"I would fain know if I am destined for so glorious a career," cried the Tree, rejoicing.

“也许某一天我也注定要做一件这样光荣的事情！”枞树高兴地叫道。

I would fain have stayed at home.

我乐意留在家里。

I would fain stay at home.

我真乐意呆在家里。