I left the island with a light heart.

我怀着愉快的心情离开了那个小岛。

Thus I'll go back with a light heart.

我可以带着愉快的心情回去了。

We can set to work with a light heart.

我们可以轻松地开始工作。

He started for his holiday with a light heart.

他怀着轻松的心情动身去度假。

He faces all the challenges with a light heart.

他以平常的心态面对一切的挑战。