我还想要4杯牛奶。（用英语翻译）

I'd like to have another four bottles of milk.

要用一个动词have,因为want to do sth. or would like to do sth. 都需要一个动词,虽然汉语表述中省略了.

I want 4 more bottles of milk
I want another 4 bottles of milk

I would like four more bottles of milk

and i want four cups of milk

I'd like four more cups of milk.

I want four more cups of milk