a second cup of tea为什么等于another cup of tea?

have a second cup of tea,please. 为什么是a cup of tea 不是 a cup tea a cup of tea ? a cup of tea还是the cup of tea over a cup of tea ( ) a cup of tea ,please. another cup of tea的意思 would you like cup of tea?A,another,Yes plea CUP OF TEA怎么样 英文 cup of tea Can l have another cup of tea? Can l have one ___ cup of tea have a cup of tea,----?选择