To make a ham sandwich you put a slice of ham between two slices of bread.

把一片火腿夹在两片面包之间就做成了火腿三明治。

youdao

Chip Sandwich, New Zealand. Potato chips between two slices of bread and tomato sauce. Carbohydrate overload.

炸土豆条三明治：产自新西兰，土豆条被放在两旁面包之间，抹上番茄酱。超高糖分含量。

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Thus you shouldn't eat more than two slices of bread a day and have pasta, rice, or potatoes only twice a week.

因此，你一天不应该吃多于两片面包，一个星期只吃两次面条，大米或土豆。

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At its simplest, a sandwich is two slices of bread enclosing a filling.

NPR: The Art Of Sandwich-Making

According to popular legend, the sandwich was invented by John Montagu, the fourth Earl of Sandwich, who, while gambling, told his butler to put some meat between two slices of bread so he could eat without interrupting the game and getting grease on the cards.

NPR: The Art Of Sandwich-Making

No extra calories are needed during the first 28 weeks of pregnancy and only an extra 200kcal per day are required during the last 12 weeks, the equivalent of two small slices of bread.

BBC: Fat, pregnant or both?