and

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..and stomach,
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..and stomach, 以及胃部

This one measures 45m and is the longest animal ever recorded.
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This one measures 45m and is the longest animal ever recorded. 这一只达到了45米 是有记录以来所有动物中最长的

and so grow to immense lengths.
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and so grow to immense lengths. 不断生长 体长极长

..and they do so in astounding numbers.
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..and they do so in astounding numbers. 而且规模惊人

..and they are lethally efficient.
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..and they are lethally efficient. 而且效率十分之高

And now, with the exhausted rays trapped against the surface,
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And now, with the exhausted rays trapped against the surface, 精疲力竭的蝠鲼无路可逃

..and the young ones follow her lead.
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..and the young ones follow her lead. 年轻虎鲸则紧跟它的脚步

and that is today's lesson.
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and that is today's lesson. 而这正是这节课的主题

The rays are fast and can outmanoeuvre an orca.
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The rays are fast and can outmanoeuvre an orca. 蝠鲼的速度很快 甚至快于虎鲸

..and start to mate.
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..and start to mate. 而是直接开始交配