求翻译：读完《秘密花园》这本书后，我懂得了，让自己快乐起来！我们无法改变整个世界，但我们至少能够改变自己。要记住，让自己快乐起来！是什么意思？

After reading the book the secret garden, I understand, make yourself happy! We can't change the world, but we can at least change. Remember, make yourself happy!