搞不懂

wǒ gǎo bù dǒng le wǒ bù zhī dào tā men zěn me bǐ wǒ men lái de hái zǎo

我搞不懂了。我不知道他们怎么比我们来得还早。

I'm stumpe. I don't know how they got here before us.