The Ganges river dolphin is also in grave danger; only a few thousand remain, and they live in some of the most polluted rivers on Earth.
恒河河豚也是岌岌可危。 现仅存数千头，生活在地球上污染最严重的水域。
In the United States, there are wide plains and high mountains, thousands of lakes and rivers of all sizes, cool forests and hot deserts, and a coastline several thousand miles long.
美国有广袤的平原、高大的山脉、数以千计形状各异的江河湖泊、凉爽的森林、炎热的沙漠，以及长达数千英里的海岸线。
About one hundred thousand of these rivers of ice flow down mountains. Some start from thousands of meters up a mountain. They can flow to areas just a few hundred meters above sea level.
成千上万条冰水河流自山上顺流而下，其中的一些来自于几千米高的山脉，它们可以流向海拔只有几百米的地区。
About one hundred thousand of these rivers of ice flow down mountains. Some start from thousands of meters up a mountain. They can flow to areas just a few hundred meters above sea level.
成千上万条冰水河流自山上顺流而下，其中的一些来自于几千米高的山脉，它们可以流向海拔只有几百米的地区。
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