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These are Chinese mitten crabs,
这些是中华绒蝥蟹
named for their strange hairy claws.
因它们长毛爪子得名
They may migrate as much as 1,500 kilometres
它们可以迁移长达1500公里
from tributaries and lakes to the river mouth,
从支流和湖泊一直到河口
where they gather to breed.
他们在那里繁殖后代
A similar migration is made by the giant Yangtze sturgeon,
中华鲟也有相似的迁徙
which can reach four metres long and weigh half a ton.
中华鲟能长到4米长 半吨重
In recent years,its numbers have declined dramatically
近些年来 它们的数量骤减
as its migration is impeded by ever more river dams.
这是由于它们的迁徙被越来越多的河坝阻挡了
But it isn't just animals like the sturgeon that are in trouble,
但是不仅中华鲟有这样的境遇
the entire Yangtze River ecosystem is being poisoned.
整个长江的生态系统都遭到了破坏
In spite of being the subject of an ambitious clean-up plan,
虽然有显耀的清理计划项目
today the river is reckoned to be the biggest
估计长江是最大的
single source of pollution entering the Pacific Ocean.
污染太平洋的单向水源
