A bird and a duck are going to see their friend, Mr Fox. On the way there, they meet a river. The river is in front of them.

鸟和鸭子打算去看望他们的朋友狐狸先生。在去的路上，他们遇到了一条河。这条河拦在了他们的面前。

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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。

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When they see a plane they think it is a strange bird or even a god.

当他们看到飞机，他们觉得这是个奇怪的鸟，甚至是上帝。

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And if travellers come to see the condors, locals may learn that they can earn more money protecting a live bird than they can save by killing one.

BBC: Trekking Peru��s Santa Cruz trail