Beijing believes that the three Japanese carriers it referred to, built for helicopter operations, could eventually be converted into full aircraft carriers.

北京认为日本建造的三艘直升机登陆舰最终全部会转为航母。

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A helicopter carrying his chief of operations was captured at a refuelling stop with help from Americans.

一架载有其作战参谋的直升机在一次降落加油时被俘获，这次行动得到了美国的帮助。

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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。

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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