乐观和悲观都是强大的力量，我们每个人都必须选择两者之一，来塑造我们的前景和预期。
Optimism and pessimism are both powerful forces, and each of us must choose which we want to shape our outlook and our expectations.
乐观正逐渐替代悲观。
总体上的乐观和悲观都很重要。
乐观和悲观都是人的个性，它会影响人们对不确定性的反应，但也会受到不确定性的影响。
Optimism and pessimism are personality traits that condition people's reaction to uncertainty, but they are also influenced by uncertainty.
我非常欣赏科学家们的创造力，他们能测试八哥的乐观和悲观，测试灌丛鸦和草甸田鼠的情景记忆，测试老鼠的欢乐。
I really enjoy the ingenuity of scientists testing optimism and pessimism in starlings, episodic memory in scrub jays and meadow voles, joy in rats.
经济衰退发生在当乐观转为悲观，当经济不得不为未来繁荣下赌注。
Recessions occur when optimism turns to pessimism, and businesses are reluctant to place bets on a prosperous future.
实际上，各大小芯片制造商很可能会根据自身的产品市场，技术能力，根据自己对这道题目或乐观或悲观的判断而选择走各自不同的道路。
Indeed, it seems likely that big, smart companies will probably come to different conclusions, depending on their markets, their competencies, and their relative optimism or pessimism.
“我的脑子里总是冲撞着各种声音，”Graham说，“极端的悲观主义和乐观主义并存。
“I’ve got a pretty loud brain, ” says Graham. “The extreme pessimism and optimism.
金融市场经过了它自有的乐观时期和悲观时期的周期循环，但幸运的是，它们没有在同一时间同时经历这些时期。
The financial markets experience their own cycles of optimism and pessimism, but thankfully, they won’t all go through these cycles at the same time.
金融市场经过了它自有的乐观时期和悲观时期的周期循环，但幸运的是，它们没有在同一时间同时经历这些时期。
The financial markets experience their own cycles of optimism and pessimism, but thankfully, they won't all go through these cycles at the same time.
做生活的领导者，而不是悲观者或乐观者。
也许对于美国和欧洲的悲观和对新兴市场的乐观一样地言过其实。
And perhaps the pessimism about America and Europe is as overdone as the optimism about emerging markets.
这一团队以及其他团队先前的研究工作显示，羊、猴子、猪和鸟（八哥）也都有乐观或悲观之别。
Prior work by this team and others suggests that sheep, monkeys, pigs and a bird (the starling) also appear to either be optimists or pessimists.
但是，乐观者与悲观者都犯了同样的错误。
Yet optimists and pessimists alike are making the same mistake.
但是，乐观者与悲观者都犯了同样的错误。
Yet optimists and pessimists alike are making the same mistake.
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