没有人确切地知道它是什么时候或者为什么开始成为和平的象征。

No one knows for sure when or why it began to symbolize peace.

youdao

没有人真正知道它是什么，或是它为什么存在？

And nobody really knows what it is or why it's there.

youdao

没有人真正知道它是什么，或是它为什么存在？

And nobody really knows what it is or why it's there.

youdao