"Bananas" is the plural form of "banana". The origin of the word is uncertain, but it is thought to have come from Wolof, a language spoken in Senegal.

Here are some Engpsh examples:

I bought a bunch of bananas at the supermarket. (我在超市买了一串香蕉)
Bananas are a good source of potassium. (香蕉是一种很好的钾质来源)
My favorite fruit is bananas. (我最喜欢的水果是香蕉)