translation.en: If you try to weigh it -- of course it's very easy to weigh it, and when you eat it, the weight matters -- but suppose you try to measure its surface.
translation.zh: 如果您想称它的重量，当然称它是非常容易的。 当你吃它时，你关心的是重量。 但是假设您想 测量它的表面积。