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Scientists have discovered why cockroaches love filthy conditions and what makes them so hard to kill — and apparently, it's all in their DNA. 科学家们已经发现了为什么蟑螂喜欢肮脏的环境，以及是什么使得它们如此难以被杀灭--很明显，原因都存在于它们的DNA中。 Researchers say they have identified specific genes which allow the critters to do anything from eating toxic food to regrowing limbs. 研究人员称，他们已经发现了一些特定的基因，这些基因可以让这些生物从吃有毒食物到再生四肢，无所不能。 Shuai Zhan, of the Institute of Plant Physiology and Ecology in Shanghai, says the American cockroach has one of the largest genomes known to exist among insects. 上海植物生理生态研究所的詹帅表示，美国蟑螂的基因组是昆虫中已知的最大基因组之一。 | 
