On large ranches, copters have sirens for scaring out cattle lost in the bush.在大的牧场里, 直升机装有警报器,可以把失散的牛从灌木丛中吓出来.Four US copters have gone down in Iraq in recent weeks.近几周以来,已有4架美军直升机坠落.High Technology - Enhances special a...
Helicopters have been upgraded and modernized...直升机已经更新换代，装配了现代化设备。The supplies need to be offloaded and put on helicopters.这些补给要卸下来装上直升机。The helicopters will fly again and again and again.这些“直升机”将会一波又一波地实施空投.More than 2...