The mixed rock occurring in the first formation of the Langshan Group is probably the result of volcanic activity rather than that of faulting or metamorphism.是什么意思_The mixed rock occurring in the first formation of the Langshan Group is probably the result of volcanic activity rather than that of faulting or metamorphism.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句