The relationship between Killing zone boundary and defense efficiency is expounded from the point of view of covering protected object capability by air-defense missile and its shift of fire.

从地空导弹对所保卫目标的掩护能力、火力转移能力等方面，论述杀伤区远界与防卫效率的关系。

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Instead, the biggest sharks identify a location from which to strike, and then search the surrounding killing zone for their next victim.

BBC: Earth News - Great whites 'plan' seal attacks

By tweaking the design of a cull - expanding the central killing zone, and choosing sites carefully to take advantage of hard boundaries like rivers and motorways - Defra's chief veterinary officer Nigel Gibbens argues it should be possible to maximise the positive impact on bovine TB infection rates in cattle.

BBC: Badgers back in the firing line