sandwich是可數名詞還是不可數名詞

Right, who's for a toasted sandwich then?

好了，那誰想要一個吐司三明治呢？

She took a couple of bites of the sandwich.

她咬了兩口三明治。

The sandwich bar is generally packed at lunchtimes.

在午餐時間三明治櫃枱前通常都擠滿了人。