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But as with many such suppositions in natural history, no one had ever tested it.
博物学中虽然有许多类似的假设，却从没人对此考证过。
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I have rejected ideas, suppositions and theories that it is inherited, that it is instinctual.
我拒绝了观念 、 推测和那种说它是通过继承和本能获得的理论.
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