I'd like a white coffee, thanks.

我来一杯清咖啡。

B: I have a medium white coffee.

我要中杯淡咖啡。

I never touch white coffee.

我从不碰白咖啡。

Do you want black or white coffee?

你想喝清咖啡还是牛奶咖啡？

Do you want black or white coffee?

你想喝纯咖啡还是牛奶咖啡？