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Being flightless, the returning penguins must cross the open beach on foot.
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Being flightless, the returning penguins must cross the open beach on foot. 由于不能飞 企鹅必须步行穿越空旷的海滩

The shark relies on surprise.
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The shark relies on surprise. 可大白鲨让人惊奇

The largest predatory fish on the planet.
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The largest predatory fish on the planet. 地球上最大的掠食性鱼类

Another predator is on the prowl.
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Another predator is on the prowl. 还有掠食者在游弋

The seals here thrive on a diet of fish and squid.
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The seals here thrive on a diet of fish and squid. 海豹在吃这里大量的鱼和枪乌贼(即鱿鱼)

The shallow temperate seas support the greatest concentrations of fish on our planet.
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The shallow temperate seas support the greatest concentrations of fish on our planet. 这片温和的浅海是地球上鱼类最密集的地区

Krill, shrimp like creatures. By weight they're the most abundant animals on the planet. A single swarm can contain two million tons of them
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Krill, shrimp like creatures. By weight they're the most abundant animals on the planet. A single swarm can contain two million tons of them 磷虾,一种小型虾类,如果按重量计算 他们是地球上最多量的动物,一群就可达200万吨

by slapping fins on the surface.
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by slapping fins on the surface. 以此相互传送声音信号

She must leave now, while she still has enough energy to guide and protect her calf, on the long voyage ahead.
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She must leave now, while she still has enough energy to guide and protect her calf, on the long voyage ahead. 她现在必须离开 趁她还有足够的能量 在漫漫征途之中来指导和保护她的幼子

Neither seem likely to produce enough nourishment to support bird life on this scale.
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Neither seem likely to produce enough nourishment to support bird life on this scale. 而且看上去也不能提供给鸬鹚足够的食物