time.
i drank five cups of coffee. imagine you have a big pot of coffee. you take one cup of it. that’s one “part” of the total amount of coffee in the pot. so here, “cup” is a specific word for “part”. specifically, the size of the part is the amount that a cup holds. this sentence is also about content (a←b). what’s in the cup? coffee. the content of the cup is coffee. in this case, we’re not saying what the cup is made of. a cup is basically just an empty space and you can fill that empty space with some sort of content.
a lot of people are at 