two thousand还是two thousands正确

thousand与数词连用时，不加s

例句：There are two thousand doctors and nurses working hard in that hospital.

句意：在那家医院里有两千名正在努力工作的医生和护士。

thousand与基数词搭配表示具体数目，不用复数thousands of意为“成千上万的”，表示不确定的数字

例句：

The earthquake let thousands of people homeless.

句意：这场地震让成千上万的人无家可归。