科学家担心由于长江水位的改变，会使得未感染区域滋生一些钉螺栖息地。
Scientists fear changes in water levels along the Yangzi could create new snail habitats in areas previously untouched by the disease.
此次旱情属50年一遇，目前，长江水位处于三峡大坝2003年运营以来的最低值。
The severe drought, the 1st seen in the past half century, has kept the water level in the Yangtze the lowest since 2003, when the Three Gorges Dam went into operation.
因为冰冻，长江水位降到自从1866年的最低位，这影响了船运，渔业和淡水供应。
As the Yangtze froze, its height fell to its lowest seasonal level since records began in 1866, affecting shipping, fisheries and water supply.
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