看，海蒂，我现在明白你为什么这么不开心了。

See, Heidi, I understand now why you are so unhappy.

youdao

我开始明白为什么你在地球上这么不开心了。

I'm starting to see why you're so unhappy here on Earth.

youdao

今天晚上，姥姥脸上洋溢着特别幸福的笑容，你知道她为什么这么开心吗？

This evening, my grandma's face was alive with special happy smile. Do you know why she was so happy?

youdao