Robots cannot harm humans or allow humans to come to harm.

机器人不能伤害人类，也不能允许人类受到伤害。

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The technology involves caterpillar ovary cells, which were isolated 20 years ago, and a virus called baculovirus that infects insects but does not harm humans, Adams said.

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So far federal regulators have found no evidence of harm to humans.

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Japanese government officials stress that the radiation leak at its current level will not cause harm to humans at least 30 kilometers away.

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