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but he cannot swim indefinitely.
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but he cannot swim indefinitely. 但是它不能永远游在水里

He will drown if he doesn't find land somewhere in this vast ocean.
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He will drown if he doesn't find land somewhere in this vast ocean. 如果在这片浩瀚的海洋里找不到陆地 它就会淹死

He is forced to head out into deeper water.
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He is forced to head out into deeper water. 它必须进入更深的水域

the male can take to the sea in search of food. Ducking and diving, he hopes to ambush seals resting on the remaining fragments of ice.
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the male can take to the sea in search of food. Ducking and diving, he hopes to ambush seals resting on the remaining fragments of ice. 公熊则来到大海里寻找食物, 潜伏在水中准备袭击在残留的冰块上休息的海豹

In these new surroundings, he is a surprisingly adept swimmer.
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In these new surroundings, he is a surprisingly adept swimmer. 在这个新环境里, 北极熊变成了一个身怀绝技的游泳高手

He attempts to spread his weight,
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He attempts to spread his weight, 这只北极熊试图分散身体的重量

where he can keep it warm.
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where he can keep it warm. 可以让蛋保持足够的温度

He doesn't have to waste time looking for mates -
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He doesn't have to waste time looking for mates - 它不必浪费时间寻找配偶

so he can concentrate with them on keeping fit and healthy.
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so he can concentrate with them on keeping fit and healthy. 所以它要做的只是保证它们健康精壮

and they follow him closely as he travels across this desert
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and they follow him closely as he travels across this desert 它们一起紧跟着它穿越沙漠