万变世界中，唯一不变的就是改变。适者生存，个体不被社会所抛弃的方法就是改变我们自己来适应这个社会，从生物型的个体转化为社会型的个体。本书提出了'适应力'这个概念，通过'三步适应法'：第一步，接受改变；第二步，扩大选择范围；第三步：采取精准行动，为在感情、事业中感到迷茫、困顿的人提供指导，在适应现实的前提下，活出快乐的自己。（In a highly changeful world, the only thing remaining unchanged is change itself. Only the strongest will survive so that the method for the individuals not to be eliminated by the society is to change themselves to adapt to the society and to transform from the biology-oriented individual into the society-oriented one. This book puts forward the concept of 'adaptability' and the 'three-step adaptability method': the first step is to accept the change; the second step is to expand the scope of choice; the third step is to take the accurate action, which provide guidance to the people feeling confused and stuck in their affection and career so that they can lead a happy life under the premise of adapting to reality.）