I don't understand what is the meaning of this sentence .I don't understand what the meaning of this sentence is .这两句哪一句对啊

I don't understand what is the meaning of this sentence .I don't understand what the meaning of this sentence is .这两句哪一句对啊
I don't understand what is the meaning of this sentence .
I don't understand what the meaning of this sentence is .这两句哪一句对啊

I don't understand what is the meaning of this sentence .I don't understand what the meaning of this sentence is .这两句哪一句对啊
下面那句正确,因为是正常的陈述句,第一句中,将后面的what引导的疑问句直接用陈述句中,这是不对的.