求翻译：　　This truth seems to be self-evident. In reality， however， we do see a lot of people who always complain that they lack the ability to do something or that their difficulties are too great to overcome. For some， this might be true. But for the others， this only shows that they have lost heart. Why do some people often feel frustrated even though they are capable of doing something？是什么意思？

待解决 悬赏分：1 - 离问题结束还有