STUDY ON INFLUENCE OF SAND-AND-GRAVEL LAYER THICKNESS UP BLOCK-STONE RAILWAY EMBANKMENT ON COOLING EFFECT OF FROZEN-SOIL FOUNDATION是什麼意思_STUDY ON INFLUENCE OF SAND-AND-GRAVEL LAYER THICKNESS UP BLOCK-STONE RAILWAY EMBANKMENT ON COOLING EFFECT OF FROZEN-SOIL FOUNDATION在線翻譯_英語_讀音_用法_例句