Humans and animals can spread disease even though they show no sign of illness themselves.
人和动物可以传播疾病，即使他们自己没有表现出患病迹象。
It seems as though animals and humans are much more alike than we know.
动物和人类的相似处似乎比我们知道的还要多。
It seems as though animals and humans are much more alike than we know.
动物和人类的相似处似乎比我们知道的还要多。
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