使用了when引导的时间状语从句，并用must表示必须执行的义务。
Prone to frustration Some people tend to fall into frustration whenever they encounter difficulties, as if the whole world were against them. They blame their leaders for lack of recognition at work, blame teachers for poor academic performance, or complain about job prospects when their income is low. As these negative emotions accumulate, it is only natural to feel depressed. However, the world will not change for you. In other words, when you cannot change the world, you must take the initiative to adapt to it. Only then can you potentially achieve your life goals.
容易沮丧有些人面对困难时，总是容易陷入沮丧的情绪中，仿佛全世界都在与自己作对。在工作中不得志，便责怪领导不赏识；学习成绩不理想，便怨恨老师教导不力；收入不如他人，便抱怨工作没有前途。当这些负面情绪不断积累，难免会让人感到消沉。然而，世界并不会为你而改变。换言之，当你无法改变世界时，唯有主动去适应它，才有可能实现你的人生目标。