人在不同的阶段会追求不同的生活，这就是不同。
People in different stage will chase for different life, that makes the difference.
在项目中，我们可让一个人在不同的阶段扮演不同的角色。
On some projects, we had one person performing different roles in different phases.
科学家们已经可以识别不同的睡眠阶段，而且发现，人在睡眠很少的情况下，机体仍然很好的运转，但只是在睡眠时做了梦才如此。
Scientists have identified various stages of sleep, and they have found that humans can function well on very little sleep, but only if they dream.
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