- For five months of the year it's sealed by an ice sheet over a metre thick.
每年中总有5个月 湖面被1米厚的冰层覆盖 - Baikal is the oldest lake in the world
贝加尔湖是世界上最古老的湖泊 - and, despite the harsh conditions, life flourishes here in isolation.
尽管生存条件恶劣 生命仍在这个与世隔绝的地方得到了兴盛 - 80 percent of its species are found nowhere else on Earth,
湖里80%的物种 在地球上其它地方都不存在 - including the world's only fresh water seal.
包括世界上唯一的淡水海豹 - With this seal
有了这种海豹 - and its marine-like forests of sponges
再加上海底森林一般的海绵
80 percent of its species are found nowhere else on Earth, 湖里80%的物种 在地球上其它地方都不存在
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