His photo is a wonderful happy moment caught with perfect timing.

他的照片抓拍到的是开心一刻，时机掌握得很好。

A happy moment is always short.

欢乐的时光总是很短暂。

It is such a happy moment for me.

那对于我来说是一个快乐的时刻。

We would never forget this happy moment.

我们永远不会忘记这个幸福的瞬间。

A happy moment is always transient.

快乐的时光总是很短暂。