For example, children put things into two categories, edible and inedible. To determine which category something is, a child will just stick it into his mouth for a taste. This is an ability children have from birth.
譬如小孩子就把東西分成二類，一種是可以吃的、一種是不能吃的，他如何辨別，就是把東西放進嘴巴裡嘗一嘗，這是與生俱來的能力。