In order to make CST more practical and easier to popularize, it is essential and urgent to keep on studying and developing CST at lower unit level to establish basic soil classification units of CST.是什么意思_In order to make CST more practical and easier to popularize, it is essential and urgent to keep on studying and developing CST at lower unit level to establish basic soil classification units of CST.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句