野生动物纪录片坚称你在片中的所见所闻都是真实的，但据一位资深环境纪录片工作者在新书中写道，事实并非总是如此。

Wildlife documentaries come with the promise that what you're seeing and hearing is genuine - but that's not always the case, according to a new book by a veteran environmental filmmaker.

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野生动物工作者则发射声音很大的炮弹来把鸟从水边轰开。

Wildlife workers are also firing loud cannons to "haze" birds from the water's edge.

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