be contagious

基本解释

Worse yet, bank runs can be contagious.
更糟糕的是，银行挤兑可以传染。
This suggests stupidity may indeed be contagious – particularly if it is presented in narrative form.
这表明愚蠢或许确实具有传染性——尤其是如果它是按叙述形式呈现的话。
Today, we discover the logical extension of this earlier research — if happiness can be contagious, it stands to reason that other moods may also be, like loneliness.
如今，我们发现了这一先前研究合乎逻辑的延伸——如果快乐是可以传染的话，那么其他的情绪比方说孤独也会传染也就顺理成章了。

Laughter could be viewed as a form of involuntary noisemaking and it's contagious.
我们可以把笑声视为不由自主地发出的声音,然后笑声有感染性。
耶鲁公开课 - 心理学导论课程节选

If you make a point of enjoying yourself, your positive attitude will be contagious.
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The World Bank hopes this new way of doing things will be contagious: if it works in telecoms, it might also succeed in transport.
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But transplanting pig cells into people is still controversial, since it brings the risk of transplanting pig diseases (which may be contagious) at the same time.
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