There were three sea-level change cycles during Xishanbulake stage.The phosphorite was the result of the earlier sea-level change.是什么意思_There were three sea-level change cycles during Xishanbulake stage.The phosphorite was the result of the earlier sea-level change.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句