Hebgen Dam, an earthfill structure with an unreinforced concrete corewall located on the Madison River at its entrance to Madison Canyon.是什么意思_Hebgen Dam, an earthfill structure with an unreinforced concrete corewall located on the Madison River at its entrance to Madison Canyon.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句