到1999年时，南澳大利亚州的平均河水含盐度降低了20%多。

By 1999 the average salinity of the river in South Australia had fallen by over 20%.

youdao

到1999年时，南澳大利亚州的平均河水含盐度降低了20%多。

By 1999 the average salinity of the river in South Australia had fallen by over 20%.

youdao