"She wants the french fries."
Translation:Cô ấy muốn khoai tây chiên.
The thin chips are called French Fries in the UK. The fat/chunky chips are called chips in the UK. They're all called fries in the US.
The things which the US call "chips" are actually slices of potato, cooked until they are crisp, an adjective meaning "thin, dry and brittle". An abstract "chip" of something is larger and thicker than a slice of something. Thus, in the UK, "potato chips" are called crisps and "fries" are named according to their size - French fries, chips and wedges.
The origin of the word "French" in "French fries" is a little odd. It is apparently nothing to do with France. "Fry" in English can mean various methods of frying, whereas "frire" in French specifically means "to deep-fry". Thus, "French-fry" came to be used to clarify which kind of frying was meant.
I haven't researched this deeply so I may not be correct about this. Here is my main source: https://www.quora.com/Do-the-French-call-them-French-fries-Is-the-French-term-for-that-food-better-translated-as-the-British-term-for-chips-or-is-it-some-other-term-entirely/answer/John-David-Ward?ch=10&share=1677c697&srid=hxfL