贝加尔湖
Polly spends the fifth day of the Trans-Siberian running along Lake Baikal, the deepest and oldest lake on Earth.
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Keep it on your phone →波莉在第五天早上醒来,发现世界变成了水。火车沿着贝加尔湖的南岸行驶。湖水填满了整个窗户:与其说是湖,不如说是海,只不过它的静谧和颜色的清澈是无法想象的,那种蓝色仿佛从水面深处升起。渔夫伊戈尔已经醒了两个小时。他在窗边,手里拿着一个小笔记本。“贝加尔湖,”他说,“是世界上最深的湖。最深处有一千六百四十二米。它也是最古老的湖,有两千五百万年的历史。大多数湖泊随着时间的推移被沉积物填满。贝加尔湖位于一个仍在扩张的裂谷中。湖底下降的速度比沉积物填充的速度快。”外面的水如此清澈,波莉甚至能看到浅水区湖底的巨石。在合适的条件下,能见度可达四十米。“它还储存了,”伊戈尔说,“地球上百分之二十三的未冻结淡水。比整个北美大湖的总和还多。”波莉看着湖水。它看起来不像是百分之二十三的任何东西。它看起来像一个静止的蓝色整体。火车在斯柳江卡站停下。伊戈尔下了车。他用两根手指郑重地握了握波莉的翅尖。“三天捕鱼。然后回家。”他通过窗户挥了挥手,然后消失了。火车沿着湖岸又行驶了三个小时。一群贝加尔湖海豹在一公里外的水面上探出头来。它们是世界上唯一的纯淡水海豹。波莉思考着规模。在她下面是比她的物种还古老的水。在那水中有一种叫做贝加尔湖磷虾的小粉红色虾,它在地球上其他地方不存在。它让湖水保持清澈。它已经保持清澈了两千万年。
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