The helicopters will be used for search-and-rescue missions, casualty evacuation, observation and surveillance, and limited electronic intelligence gathering.
据悉，该类轻型直升机将被用于搜索和救援任务，疏散伤员，观察和监视，及限制电子情报的搜集。
A fire within a tall building must be contained within a limited space since rapid emergency evacuation of the building's occupants is very difficult because of the building's height.
由于大楼的高度，快速的紧急疏散楼内住户是非常困难的，因此高楼的火情必须控制在有限的空间里。
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