乐观主义可能起始于最卓绝的人类天份：精神的时间旅行——在头脑中沿时间和空间向前向后移动的能力。
Optimism starts with what may be the most extraordinary of human talents: mental time travel, the ability to move back and forth through time and space in one's mind.
随着时间，到达火星最乐观也需要五千亿美元。
An optimistic bill to get to Mars would come to half a trillion dollars over time.
不过，就是最乐观的观点也认为，该技术投入实用还至少需要八年的时间。
Even an optimistic view puts the technology eight years away from deployment, though.
即使是最乐观的，善于交际的人会受到深深的忧郁，变得内向了一段时间。
Even the most optimistic and sociable people can be affected by deep melancholy and become introverts for some time.
即使是最乐观的，善于交际的人会受到深深的忧郁，变得内向了一段时间。
Even the most optimistic and sociable people can be affected by deep melancholy and become introverts for some time.
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