7 篇文章
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

Each year explorers chart over a hundred miles of new cave passages.
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Each year explorers chart over a hundred miles of new cave passages. 每年 探险家们都会测绘 上百英里新的洞穴通道

As the explorers went deeper into the cave,
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As the explorers went deeper into the cave, 随着探险家们深入洞穴

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

but cave explorers were soon to make an even more astonishing discovery.
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but cave explorers were soon to make an even more astonishing discovery. 但是洞穴探险家们 很快又有了更惊人的发现

Explorers entering this dangerous cave
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Explorers entering this dangerous cave 探险家们进入这个危险的山洞时

Early explorers told tales of lakes that smoked, as if on fire.
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Early explorers told tales of lakes that smoked, as if on fire. 早期探险家看到这种湖面上“冒烟”的情景 还以为是湖底着了火

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