Personnel Safety in Helicopter Operations: Heli-rescue Manual ;

安全人员在直升机业务：贺丽救援手册 ；

youdao

The helicopter's producer, Sikorsky, hasn't acknowledged that the helicopter is one of theirs, and the U.S. Army's Special Operations Command hasn't confirmed it either (and won't).

该直升机的制造商西科斯基尚未承认这架直升机是否是他们的，而美国陆军特种作战司令部同样未予确认。

youdao

Different versions of the MI-17 helicopter are designed specifically for high-altitude military operations and are in service in the mountains of Afghanistan.

MI - 17直升机的不同版本专门为高海拔军事作战而设计，并在阿富汗的山区服役。

youdao

Industry body Oil and Gas UK also indicated it was too early to say when full offshore helicopter operations could be reintroduced.

BBC: Nine Super Puma helicopters flying again after ditching

The Royal Navy's largest ship, the helicopter carrier HMS Ocean, is moored in the Thames off Greenwich, where it will be a base for helicopter operations and house troops providing security at the Greenwich Park Olympic venue.

CNN: London's Olympic security headache

The Royal Navy's largest ship, the helicopter carrier HMS Ocean, is now moored in the Thames off Greenwich, where it will act as a base for helicopter operations and house 400 troops providing security at the Greenwich Park Olympic venue.

CNN: UK faces security questions ahead of London Olympics