执行救助任务或者符合社会公共利益的其他飞行任务所必需的。
It is indispensable for performing a rescue mission or other flight missions conforming to the public interest of the society.
因此两周前我因为协助一项褐鳟鱼救助任务而站在德比郡那条严重枯竭的Lathkill河流时，我们遇到了持续7小时的暴雨。
So two weeks ago I stood in the severely depleted River Lathkill in Derbyshire assisting with a brown-trout rescue mission as horizontal rain belted us for seven hours.
皇家搜救队的主要职责是救助皇家空军的士兵，但在和平时期，他们主要负责民众的紧急救援。皇家搜救队每年要处理1000多起紧急救援任务。
The Search and Rescue teams' main duty is to recover RAF personnel but in peacetime they mainly respond to civilian emergencies, dealing with more than 1, 000 calls a year.
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