Say you drink a cup of orange juice that's three oranges and if I told you to eat three oranges you'd be very full, but if you drink a cup of orange juice you don't even consider it calories or a food.
比如你喝一杯橙汁,那就是一次喝下了三个橙子,如果我让你吃三个橙子,你会很饱,但如果你喝一杯橙汁,你甚至不认为它包含什么卡路里或是一种食物。