信息素是一种化学信号，常与吸引力有关。我们散发出的化学信号有许多种，包括那些传递警觉，攻击或者其他情绪的化学信号。
Pheromones: they're those chemical signals often associated with attraction. But there are many chemical signals we give off-including ones that might signal alarm, aggression or other emotions.
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