In 1970s ,the discovery of Wenliu coal-formed field marked a new period of Neopaleozoic field exploration in North China.是什么意思_In 1970s ,the discovery of Wenliu coal-formed field marked a new period of Neopaleozoic field exploration in North China.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句