Chemical spraying and rodent poisons can be dangerous to humans.

药剂喷洒和灭鼠药可能对人类有害。

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Primitive humans needed to be able to react like this to escape from dangerous animals.

原始人们需要能够像这样反应以逃脱危险的动物。

《柯林斯英汉双解大词典》

The female of this species, when protecting her nest, may be the most dangerous bird on Earth to humans.

雌性苍鹰在保护它的巢时，对人类来说很可能是地球上最危险的鸟儿。

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While horse meat is as palatable as beef there has been concern that a veterinary drug given to horses that can be dangerous to humans.

WSJ: U.K. Arrests Men in Horse-Meat Probe

As well as posing physical danger, might robots also be dangerous to humans in less direct ways, by bringing out their worst aspects, from warfare to paedophilia?

ECONOMIST: Robotics

The robots could be sent into areas that would be dangerous for humans to enter because of high radiation levels.

FORBES: Connect