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11-07-07 male black widow spiders can sniff out a well-fed female simply by walking on her web, according to researchers. 研究人员称,雄性黑寡妇蜘蛛只需行走在雌性黑寡妇织的网上就能嗅出其是否吃饱。 the males appear to use this technique to avoid hungry female...