First, there's the gastrointestinal tract, a twisting channel that transports your food and has an internal surface area of between 30 and 40 square meters, enough to cover half a badminton court.

首先是胃肠道，这是一条输送食物的扭曲通道，内表面积在 30 到 40 平方米之间，足以覆盖半个羽毛球场。