It's just that there are limits to what rehabilitation can do. It can help patients recover such basic functions as walking and going up and down stairs. Yet it can't make them nearly the same as other people.
只是復健有其極限﹘ ﹘盡可能恢復病人走路、上下樓梯等基本功能，不可能做到與正常人毫無差別。