The ability to fly like a bird, bat, or insect gives a UAV a form of natural camouflage - even if hostile troops see it, they may well misinterpret it as an animal.

能够像鸟，蝙蝠或者昆虫一样飞行使得无人机具备了自然的伪装能力，即使敌军看见了它，也可能误以为是一只动物。

youdao

President Obama says commitment releasing the photos of abuse at Abu Ghraib and several other prisons could cause a hostile reaction against U.S.troops.

VOA: standard.2009.05.13

The colonel told CNN that the forces were waiting until early evening to begin moving out to avoid hostile fire from Bosnian government troops.

CNN: Waiting for morning

The Black Hawk is the US's most important combat helicopter, designed to move quickly into hostile environments and deliver or collect troops and armaments.

BBC: News | In Depth | Military Fact Files

Since the war in Iraq started last March, 469 U.S. troops have died -- 321 under hostile circumstances.

CNN: Military investigates hostile fire in 'green zone'