三明治的复数形式是 "sandwiches"。其来源是英国第四代首相 John Montagu, 4th Earl of Sandwich, 他喜欢在工作时间吃这种食物，所以就给它命名为 "sandwich"。
例句：
I'll have two sandwiches for lunch, please. (我要吃两个三明治午餐。)
The dep is offering a special on sandwiches today. (这家熟食店今天特价出售三明治。)
I always pack sandwiches for my workday. (我总是带三明治上班。)