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这山谷是很早以前由一条古河道干涸后而形成的。
The valley was formed ages ago when an ancient river ran dry.
youdao
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古河道砂层的存在，是影响围坝稳定的主要环境因素。
The sand stratum in old river bed is important factor affecting stability of dam.
youdao
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古河道砂层的存在，是影响围坝稳定的主要环境因素。
The sand stratum in old river bed is important factor affecting stability of dam.
youdao