Causes of Formation of Solid Cavity Inside the Roadbed in Lava Region and Its Determination Techniques and Dealing with the Hidden Trouble是什么意思_Causes of Formation of Solid Cavity Inside the Roadbed in Lava Region and Its Determination Techniques and Dealing with the Hidden Trouble在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句