15 篇文章
and, as he begins to tire, she supports him close to the surface so that he can breathe more easily.
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and, as he begins to tire, she supports him close to the surface so that he can breathe more easily. 疲劳的幼鲸被妈妈托上浮上水面好让它呼吸空气

As the current begins to build, it's up, up and away.
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As the current begins to build, it's up, up and away. 洋流开始转强时它们就只好远走高飞了

As the vegetation in one place begins to run out
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As the vegetation in one place begins to run out 当一个地方的植物即将吃光时

Fishing practice begins when the cubs are four months old.
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Fishing practice begins when the cubs are four months old. 小水獭在4个月大时就开始学习捕鱼

and at 50 degrees of latitude a radical transformation begins.
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and at 50 degrees of latitude a radical transformation begins. 北纬50°的地方是一场重大变革的起点