如果没有其他的，这将是我生命中重要的一课。

If nothing else, this has served as a life lesson.

youdao

有趣的是，我们同样也从我们的宠物身上学会同情，但是不幸的是这也总是很难的一课，因为当我们学会时，挚爱的朋友的生命也接近尾声。

Interestingly enough, we also learn about compassion through our pets but unfortunately, it is always a very difficult lesson as it is taught near the end of our beloved friends’ lives.

youdao

如果我一定要选择一项的话，最重要的一课可以总结为：生命短暂，发生的事情已经过去，未来等待我们去创造。

If I had to choose, the most important life lesson is summarized to this: life is so short.What's happened is already in the past.The future is here for us to create.

youdao