My research has found that any new smell, even one associated with relaxation, like lavender, can make you more alert and vigilant.
我的研究表明：在闻到的任何以前从未闻过的气味的时候，哪怕是像薰衣草那样能让你感到放松的气味，人都会警惕起来。
Contagious yawning is thought to be an evolved mechanism for keeping groups alert so they "remain vigilant against danger," Gallup said.
呵欠传染被认为是进化出来用于保持群体的警惕性使群体“在危险面前保持警觉，”盖洛普说。
The alert is expected to urge American citizens in Europe to be vigilant, especially when in public places such as public transportation, airports, and tourist sites, officials said.
该警告旨在使欧洲的美籍人员保持警惕，尤其是在公共场合，如公交车站，机场和旅游景点。
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