In contrast, the flight ability are weakened or lost with the increase of sterna length but decrease in its depth and width.

反之，胸骨的长度加长，深度、宽度渐小的鸟类，其飞行能力较弱或已经丧失飞行能力。

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In contrast, the flight ability are weakened or lost with the increase of sterna length but decrease in its depth and width.

反之，胸骨的长度加长，深度、宽度渐小的鸟类，其飞行能力较弱或已经丧失飞行能力。

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