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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The young bird fluttered its wings.

雏鸟拍打着它的翅膀。

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The young bird on the edge of the nest was trying his wings to fly into the world.

巢边的那只雏鸟正跃跃欲试地扑打着翅膀，准备飞向广阔的世界。

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The president's wife, Lady Bird Johnson, invited several women to a luncheon to discuss the problem of crimes committed by young people.

VOA: special.2009.06.07

The young male bird, which was dehydrated and starving, is thought to be only the fourth royal penguin to wash up there in more than a century.

BBC: Lost Antarctic Royal penguin found in New Zealand

If I was a bird I'd be looking for shelter where I could look after my young.

BBC: NEWS | UK | How your garden can be a haven for birds