It can pickle steel, but mucous lining the stomach wall keeps this poisonous liquid safely in the digestive system, breaking down your lunch but not your own stomach.

• 胃可以消化掉钢铁，但是胃的消化壁能让这些腐蚀性溶液安全的存放在我们的消化系统中，帮助我们消化午餐而不是我们自己的胃。