有些人可能觉得自己的工作不如的其他人那么有价值，也不值得肯定。
Some people may feel that their work is less valuable than others' and do not deserve acknowledgment.
如果没有一颗仆人的心，你也不值得让别人服侍你。
If you do not have a servant's heart, you are not worthy of being served.
如果这个NPV是负的，那么这个项目也不值得继续从事下去。
If the NPV is negative then the project is not worth pursuing.
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