helicopters
n. 直升机（helicopter的复数形式）
例句
There were two helicopters circling around.
有两架直升飞机在周围盘旋。
《柯林斯英汉双解大词典》
Helicopters have been upgraded and modernized.
直升机已经升级并且装上现代化设备。
Army helicopters tried to evacuate the injured.
军用直升机设法撤出伤员。
