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Dogs’ noses are incredibly keen. They can even detect changes in cortisol levels in human sweat and breath. Known as the “stress hormone,” cortisol increases when humans are under pressure. Recent research indicates that the smell of human stress can influence a dog’s behavior and emotions.
In the study, human volunteers were exposed to the stressful tasks of preparing and delivering a speech on the spot and then solving math problems. __1__ Researchers collected sweat and breath samples from the volunteers on pieces of cloth during both their stressful and restful states.
The workers were exposed to a dangerous chemical when the machine exploded.
機器爆炸時,工人們都暴露在危險的化學物品中。
The murderer was caught on the spot by the police.
凶手當場被警方逮到。
It turns out that we have more time to deal with the problems than we thought.
結果我們比預計的還有更多時間來解決這些問題。
Tom is introverted. By contrast, his brother John is extroverted.
湯姆很內向。相對之下,他哥哥約翰就很外向。