but

1820 篇文章
Low in nutrients, but high in oxygen.
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Low in nutrients, but high in oxygen. 营养物质不多 但含氧量却很高

But like all who visit the world of the high mountains
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But like all who visit the world of the high mountains 不过 与所有高山世界的拜访者一样

But even a young crane is a heavy prize
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But even a young crane is a heavy prize 一只小鹤的份量也是挺重的

But each year over 50,000 demoiselle cranes set out on one of the most challenging migrations on Earth.
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But each year over 50,000 demoiselle cranes set out on one of the most challenging migrations on Earth. 可是 5万多只蓑羽鹤每年都会 进行一场地球上最具挑战性的迁徙

but the chances of the cub reaching adulthood are slim.
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but the chances of the cub reaching adulthood are slim. 但是熊猫幼崽长到成年的机会极为渺茫

but is now believed to be a small mountain bear.
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but is now believed to be a small mountain bear. 现在已被确认为一种小型山地熊类

But at least these monkeys have a choice -
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But at least these monkeys have a choice - 这些猴子至少还有一个选择

but the panda is held captive by its diet
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but the panda is held captive by its diet 只有大熊猫因为食物始终逗留此地

But these forests hold fewer challenges for the more mobile.
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But these forests hold fewer challenges for the more mobile. 不过这些森林对于更灵活的动物来说 却没有什么挑战性

but the giant panda can't fatten up enough to hibernate.
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but the giant panda can't fatten up enough to hibernate. 可是大熊猫没能储备足够的脂肪冬眠