There is a helicopter pad right in front of the side of the Pentagon. The wing touched there, then the plane cartwheeled into the building.

五角大楼侧面有一个直升机停机坪，机翼碰到停机坪上，旋即侧滚进五角大楼的建筑中。

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Hummingbirds are well known for their wing speed and ability to hover and fly forward and backward with more precision than a helicopter.

众所周知，蜂鸟的翅膀拍打速度极快，它即可以凌空悬停，也可以快速向前飞行和向后飞行，其飞行的精准度甚至超过了直升机。

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Due to the lower flight height and the slower flight speed of helicopter, Compared with the fixed wing airplane, the visual system of helicopter flight simulator has the particularity in visual scene.

由于直升机飞行高度低、飞行速度较慢，直升机飞行模拟器的视景系统具有特殊性。

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The office is also in charge of the White House Communications Agency, which handles all presidential telephone, radio, and digital communications, as well as airlift operations through both fixed-wing and helicopter aircraft.

CENTERFORSECURITYPOLICY: Center For Security Policy

Visitors can see the falls from many vantage points: above from a helicopter or microlight fixed wing plane, at eye level walking across the Knife Edge Bridge that spans the width of the falls on the Zambian side, or from below on a hike.

BBC: Livingstone��s Zambia

The report said the Airprox board had been of the opinion that the object was unlikely to have been a fixed wing aircraft, helicopter or hot air balloon, given that it had not shown up on radar.

BBC: Airliner 'had narrow miss with UFO'