As the young bird matures, such controlled descent gradually gives way to powered flight.

一旦幼鸟成熟，类似这样的可控降落就会演变成为动力飞行。

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Glider flight is a controlled descent; pilots gain altitude only if they catch rising air and ride it aloft.

用滑翔机飞行只是对下降的控制，真正的飞行员只有不断利用上升气流才能在空中越飞越高。

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Since each droplet picked up a slight charge of static electricity as it traveled through the air, the speed of its descent could be controlled by altering the voltage on the plates.

当小油滴通过空气时，就会吸一些静电，油滴下落的速度可以通过改变电板间的电压来控制。

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Officials have been planning to ditch the station in a controlled descent that will send it hurtling into a remote area of the Pacific Ocean, 1, 500-2, 000km east of Australia.

BBC: You are in: Sci/Tech

Officials are now planning to ditch the station in a controlled descent that will send it hurtling into a remote area of the Pacific Ocean, 1, 500-2, 000km east of Australia.

BBC: UK will spy Mir in night sky