There is a contagiousness in every example of energetic conduct.

每一个积极举动都会成为榜样。

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Using identity law in talking and speech, the main idea can be highlighted to strengthen the contagiousness.

在说话和演讲中运用同一律，可以确保说话和演讲的主题突出，增强语言感染力；

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The contagiousness of the virus will influence the speed of spread, both within countries and internationally.

病毒的传染性将对国内和国际传播速度产生影响。

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Children are particularly influenced by the contagiousness of laughter, but just in general, if you hear somebody laughing, like the kids you saw before, it's the sort of thing that could easily make you laugh.

孩子特别容易,受笑声的感染，但普遍来说，如果你听到有人笑，像你们刚才看到的小孩子，这样的事物很容易引你大笑。

耶鲁公开课 - 心理学导论课程节选

The team says that it was this social connection rather than just how much attention the chimps paid to the videos that influenced the "contagiousness" of the yawns.

BBC: Earth News - Chimpanzees 'catch' contagious yawns from friends