Drilling Technology of Guiding-hole of Drain-well in the Sand and Gravel System in Guangxi Longtan Hydro-power Station是什么意思_Drilling Technology of Guiding-hole of Drain-well in the Sand and Gravel System in Guangxi Longtan Hydro-power Station在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句