All but a few babies, for instance, learn to walk by the age of two and to talk by the age of three, but no two get there quite the same way.

• 例如，除了极小数婴儿外，所有的孩子都能在两岁时学会走路，三岁时学会说话，但是没有两个孩子是以同样的方式达到这一标准的。