It is economically important to extend the operation term, the service life and enhance the operation reliability of a large-scale apparatus.

延长大型成套装置的运行周期和服役寿命，提高其运行可靠性，对增加装置的经济效益意义十分重大。

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"This was a long-term operation to steal intelligence and information that went under the radar, " he said.

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Clearly the Kenyan government could not sit back and do nothing after the kidnappings but Kenyans hope this is a very short-term operation lasting maybe just a few days.

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The defence ministry says that to sustain a long-term operation, with a proper rotation system, it ideally likes to have at its disposal three or four ships or aircraft, and up to five army units, for every one deployed at any given time.

ECONOMIST: The army