People who intentionally and frequently use humor know tension can be used deliberately to heighten the impact of the humor.

一些有意经常使用幽默的人都知道，有意地紧张可以用来提高幽默的影响。

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Including humor in a speech improves audience rapport, reduces tension, keeps the audience alert and focused, improves impact and retention, and makes the speech more memorable.

在演讲中添加幽默元素，能够增强与观众的亲和力，减少紧张气氛，令观众精力集中，增强演讲的效果和持久力，使演讲被观众记得更牢。

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A high tension wheel is definitely stiffer but may fail easier from an impact since the parts are closer to their breaking points.

高张力轮更严厉的，但肯定是从一个影响可能会失败，因为部分更容易接近他们的突破点。

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And the longer the tension persists, the more chance it will have a negative impact on the country.

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And it has contributed to the kind of international -- or internal, rather, tension that you've seen within Iran, and it's certainly had a dramatic impact -- a significant impact on the Iranian economy.

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