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。
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。
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。
Once airborne, the vertical descent path of the package would be controlled using one or more "control surfaces" - which could consist of wings, parachutes, or compressed air canisters.
一旦进行空运，包裹的垂直降落轨道将由一个或多个“操纵面”进行控制，包括机翼、降落伞或压缩的空气罐。
Once airborne, the vertical descent path of the package would be controlled using one or more "control surfaces" - which could consist of wings, parachutes, or compressed air canisters.
一旦进行空运，包裹的垂直降落轨道将由一个或多个“操纵面”进行控制，包括机翼、降落伞或压缩的空气罐。
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