16 篇文章
any male would struggle to stay on top.
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any male would struggle to stay on top. 任何雄企鹅都会拼命留在上面

brings huge quantities of food into these high rivers that normally struggle to support much life.
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brings huge quantities of food into these high rivers that normally struggle to support much life. 于是这些平常只能勉强维持众多动物生计的 高山河流终于有了提供饕餮大餐的机会

In the ascent every wing beat becomes an exhausting struggle.
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In the ascent every wing beat becomes an exhausting struggle. 上升过程中每扇一下翅膀 都得用尽全身气力

and the eagle has to struggle to control it.
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and the eagle has to struggle to control it. 金雕不得不努力控制飞行

The struggle of a giant panda mother to raise her cub
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The struggle of a giant panda mother to raise her cub 大熊猫努力养育幼崽的情景

and can make all the difference in a bear's annual struggle for survival.
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and can make all the difference in a bear's annual struggle for survival. 直接关系到灰熊每年冬天的生存能力