One kind of female butterfly mates only once in its life -- and then closes its wings to avoid "harassment" when pursued by persistent and unwanted males, a Japanese researcher said.
日本一位研究人员称，雌性红灰蝶一生只交配一次，在其它雄性红灰蝶不停地追求它时，它会合上翅膀躲避这种不必要的“骚扰”。
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德国卡塞尔大学的研究人员发现，说话时频繁使用第一人称单数代词“我”的人更容易受抑郁和焦虑症困扰，且不善人际交往。 People who say...
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