If not, we couldn't put money in the bank, buy food, clothing, or medicine from others, drive across a bridge, get on a plane—the list is endless.

如果不是，我们就不能把钱存入银行；不能从别人那里购买食物、衣服或药品；不能开车过桥，不能坐飞机——这样的事情不胜枚举。