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。
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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