Escape 500-years frequency flood, apron end average velocity is 4.37m/s, stream bed filled rubble maximum scour depth 2.8m.是什么意思_Escape 500-years frequency flood, apron end average velocity is 4.37m/s, stream bed filled rubble maximum scour depth 2.8m.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句