这个国家四分之一的人精神失常。想想三个你的亲密朋友，如果他们正常，那你便是精神失常的其中之一。
One out of four people in this country is mentally unbalanced. Think of your three closes friends; if they seem OK, then you're the one.
近一个世纪前，生物学家发现，如果他们在无脊椎动物胚胎生命的早期阶段将其分成两部分，它会存活下来并发育成两个正常的胚胎。
Nearly a century ago, biologists found that if they separated an invertebrate animal embryo into two parts at an early stage of its life, it would survive and develop as two normal embryos.
如果我们能与他们正常谈话，告诉他们要做什么呢？
What if we could just talk to them normally and tell them what to do?
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