Happiness, confidence and an optimistic nature help the brain, he added.
快乐，自信和乐观的态度会帮助大脑，他补充说。
Americans are by nature a confident and optimistic people.
美国人天生就自信、乐观。
He is by nature an optimistic man; his smile is rueful.
他天生就是个乐观的人，他的微笑让人心痛。
I'm more optimistic about human nature.
我对人性还是持乐观态度的。
Business people are by nature optimistic, especially in America.
商人们通常都是乐观的，尤其是美国的商人们。
He says the world outlook of the engineer is by nature optimistic.
他说工程师的世界观天生更乐观。
I think I'm reasonably optimistic by nature.
我想我生性是相当乐观的。
It needs a kind of firm optimistic belief in human nature.
自由教育需要一种对人性的坚定的乐观信念。
I think I'm reasonably optimistic by nature.
我想我生性是乐观的。
Simple nature is happy, optimistic, helpful is value!
⊙、简单自然就是幸福，乐观助人就是价值！
Such is human nature and nobody can be blamed for trying to be optimistic;
努力保持乐观，只是人的本性，无可厚非；
Such is human nature and nobody can be blamed for trying to be optimistic;
努力保持乐观，只是人的本性，无可厚非；
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