They were light-hearted and prepared to enjoy life.他们无忧无虑, 就准备享受生活了。

Let me finish with a slightly more light-hearted question.请允许我以一个稍微轻松一点的问题结束。

There have been many attempts, both light-hearted and serious, to locate the Loch Ness Monster.曾经有很多人尝试寻找尼斯湖水怪, 有的是随便玩玩, 有的则是认真的。

He was in a light-hearted mood.他心情愉快。