Lining and covering irrigation canals to avoid ground seepage and evaporation could save huge... [More].

对运河进行内衬和加盖以防止地表渗漏和蒸发，可节省大量的水资源。

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Lining and covering irrigation canals to avoid ground seepage and evaporation could save huge... [More].

对运河进行内衬和加盖以防止地表渗漏和蒸发，可节省大量的水资源。

youdao