双层堤基在大江大河防洪干堤中非常普遍。
Levee double - layer foundation is very common in levees along large rivers.
一个上午斯诺淋浴转化的一个干尤塞米堤谷排球变成冬季仙境上周二…
A morning snow shower transformed a dry Yosemite Valley into a winter wonderland on Tuesday…
一个上午斯诺淋浴转化的一个干尤塞米堤谷排球变成冬季仙境上周二…
A morning snow shower transformed a dry Yosemite Valley into a winter wonderland on Tuesday…
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