324 篇文章
First, though, valuable nesting places must be defended from property thieves.
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First, though, valuable nesting places must be defended from property thieves. 不过先得保护好来之不易的筑巢地 免得被其他鸟类占据

When the first polar explorers headed south,
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When the first polar explorers headed south, 第一批极地探险家前往南方时候

When the first explorers descended,
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When the first explorers descended, 第一批探险家进入这个洞后

However, human beings are seldom the first to reach these black, damp places.
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However, human beings are seldom the first to reach these black, damp places. 但是 人类绝非 这个阴暗潮湿地界的第一位到访者

Yet these depths were first explored only two years before man landed on the moon.
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Yet these depths were first explored only two years before man landed on the moon. 然而人类直到登月前两年 才第一次进入这个深渊

At dawn the first adult midges start to break out.
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At dawn the first adult midges start to break out. 黎明时分 第一只成蚊破蛹而出

For many this is their first journey across the Himalayas.
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For many this is their first journey across the Himalayas. 许多蓑羽鹤都是第一次 踏上穿越喜马拉雅的旅程

These are the first intimate images of snow leopard ever filmed in the wild.
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These are the first intimate images of snow leopard ever filmed in the wild. 这是在野外环境中 第一次近距离拍摄雪豹

and take their first steps in the outside world.
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and take their first steps in the outside world. 第一次踏足这个陌生的户外世界

they would never survive their first winter.
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they would never survive their first winter. 它们肯定无法活过第一个冬天