A2 a type of aircraft without wings, that has one or two sets of large blades that go round very fast on top. It can land and take off vertically and can stay in one place in the air直升机
More examples
The helicopter made a drop of much-needed supplies to the stranded hikers.
The helicopter was hovering above the building.
I heard the noise of a helicopter hovering overhead.
The crew of the ship were winched to safety by a rescue helicopter.
The helicopter stirred up clouds of dust.
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