Sea cucumbers are strange animals living at the bottom of the sea.

海参是生活在海底的奇怪动物。

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The heart of their argument is that humans are social animals and that in highly unequal societies those at the bottom suffer from a range of pathologies.

他们的中心论点是人类是具有社会性的动物，在高度不公平的社会中那些处在社会底层的人们遭受着病理疾病的折磨。

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Typically, this is a fish-eat-fish affair, with vegetarians like krill taking their place at the bottom (phytoplankton are plants, whereas zooplankton are animals).

这是典型的涉及在食物链底端(浮游植物是植物，反之浮游动物是动物)的象磷虾等植食动物的鱼吃鱼的事件。

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It is an uncontrollable mystery "on the bestial floor": on the floor, on the bottom, on the ground, where the animals dwell.

这是个不可控制的神话,发生在兽性的地面上：,在地上，最低处，地面上，那儿是动物栖息的地方。

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Since cesium binds to the sediment on the ocean floor, the radiation has likely had the biggest effect on bottom-dwelling fish and other animals though the consequences still aren't clear, said Tatsuo Aono, a specialist at Japan's National Institute of Radiological Sciences.

WSJ: In Japan, Relief at Radiation's Low Toll

He said that some whales appeared to guard the bottom of this "bait ball", preventing the prey from sinking to unreachable depths, while other animals in the group took advantage of the centre of the ball.

BBC: Sperm whale groups 'may corral deep squid'