我当你不知道。

I thought you didn't know.

《新英汉大辞典》

那当你七岁时你想到，“我不知道。”

So when you're seven you think, "I don't know."

youdao

当你一直在我身边时，我不知道爱护。

When you were here alongside with me, I do not cherish.

youdao

当你一直在我身边时，我不知道爱护。

When you were here alongside with me, I do not cherish.

youdao