But at what cost, we don't know. (但是以什麼樣的代價，我們並不知道。)

We will take the city back. But at what cost, we don't know. (我們會把這個都市拿回來。但是以什麼樣的代價，我們並不知道。)

We will take the city back. But at what cost, we don't know. (我們會把這個都市拿回來。但是以什麼樣的代價，我們並不知道。)