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and then, at the southern tip of Africa it meets the Agulhas Current, arriving from the east.
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and then, at the southern tip of Africa it meets the Agulhas Current, arriving from the east. 然后,在非洲南端(好望角)与 沿非洲大陆以南海域流动的厄加勒斯暖流汇合

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 Californian upwellings are seasonal and relatively small
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The Californian upwellings are seasonal and relatively small 加利福尼亚寒流是季节性洋流,相对较小.

The predator extrudes it's stomach, and wraps it around it's victims liquefying their soft parts.
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The predator extrudes it's stomach, and wraps it around it's victims liquefying their soft parts. 向日葵海星挤出它的胃 包住饼海胆直接消化其软组织

but each urchin has five teeth, which are self sharpening and are replaced every few months.
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but each urchin has five teeth, which are self sharpening and are replaced every few months. 但是每只海胆有5个锋利的牙齿 而且每隔几个月就换牙

and they can grow by half a meter a day.
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and they can grow by half a meter a day. 它们每天还能长半米

They break up the shoals into smaller, more manageable balls, and all the hunters benefit.
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They break up the shoals into smaller, more manageable balls, and all the hunters benefit. 它们将鱼群分成许多小群, 让猎人们更加易于处理.

The algae die and the food chain collapses.
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The algae die and the food chain collapses. 藻类死亡 食物链因此崩溃

Sea lions have all the agility and speed needed to collect what they want
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Sea lions have all the agility and speed needed to collect what they want 海狮拥有捕鱼所需的敏捷和速度

and seemingly delight in doing so.
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and seemingly delight in doing so. 看起来他们也喜欢这样做