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These are Chinese mitten crabs,
這些是中華絨蝥蟹
named for their strange hairy claws.
因它們長毛爪子得名
They may migrate as much as 1,500 kilometres
它們可以遷移長達1500公里
from tributaries and lakes to the river mouth,
從支流和湖泊一直到河口
where they gather to breed.
他們在那里繁殖后代
A similar migration is made by the giant Yangtze sturgeon,
中華鱘也有相似的遷徙
which can reach four metres long and weigh half a ton.
中華鱘能長到4米長 半噸重
In recent years,its numbers have declined dramatically
近些年來 它們的數(shù)量驟減
as its migration is impeded by ever more river dams.
這是由于它們的遷徙被越來越多的河壩阻擋了
But it isn't just animals like the sturgeon that are in trouble,
但是不僅中華鱘有這樣的境遇
the entire Yangtze River ecosystem is being poisoned.
整個長江的生態(tài)系統(tǒng)都遭到了破壞
In spite of being the subject of an ambitious clean-up plan,
雖然有顯耀的清理計劃項目
today the river is reckoned to be the biggest
估計長江是最大的
single source of pollution entering the Pacific Ocean.
污染太平洋的單向水源
