- Over tens of millions of years, its ancestors repurposed their wings,
经过数千万年 它们的祖先改变了翅膀的用途 - fine-tuning them to no longer fly in the air,
不再将其用于飞行 - but to pull off something remarkable...
而是另有它用 - beneath the waves.
在水下使用 - Underwater flight.
水下飞行 - Penguins have sublime buoyancy control...
企鹅拥有卓越的浮力控制能力 - and one of the most streamlined bodies of any animal,
以及动物中最流线型的身体
beneath the waves. 在水下使用
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