可能是雄性可以利用稀少的类胡萝卜素进行免疫防御和解毒，或者吸引雌性。
It may be that males can use scarce carotenoids either for immune defense and detoxification or for attracting females.
维尔博尔德和他的同事们集中研究了古代格陵兰岩石里钨的同位素，它们同黄金一样，也具有粘接铁的吸引力。
Willbold and his colleagues concentrated on investigating the ancient Greenland rocks for isotopes of tungsten, a metal that, like gold, has an affinity for bonding with iron.
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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