The beat slowed as he settled into sustained flight.

当他开始持续飞行的时候，翅膀的拍打速度慢了下来。

Flights of this length are rare for the sage  grouse, and sustained flights rarely exceed a few kilometers at a time.

这种长度的飞行对于鼠尾草来说是罕见的，持续飞行一次很少超过几公里。

They worked tirelessly to achieve their goal of sustained, powered flight, and their breakthroughs have had a profound impact on the world.

他们孜孜不倦地实现了持续动力飞行的目标，他们的突破对世界产生了深远的影响。

Alongside their massive muscles, this special lift-producing technique allows hummingbirds to achieve sustained hovering flight— an aerial feat no other bird can perform.

除了巨大的肌肉，这种特殊的产生升力的技术使蜂鸟能够实现持续的悬停飞行——这是其他鸟类无法完成的空中壮举。

To carry the 180-pound, 12-horsepower gasoline engine needed to power the controlled, sustained flight of a heavier-than-air aircraft, the wingspan of the Wright Flyer grew and grew to reach 40 feet.

为了搭载 180 磅、12 马力的汽油发动机，为比空气重的飞机提供受控、持续飞行所需的动力，莱特飞行器的翼展不断增大，达到 40 英尺。