It is believed that Wumishan cyclothems were formed in the sedimentary environment change, i. e. water depth changed from shallow to deep, then to shallow, and to be instantaneously exposed at last.是什么意思_It is believed that Wumishan cyclothems were formed in the sedimentary environment change, i. e. water depth changed from shallow to deep, then to shallow, and to be instantaneously exposed at last.在线翻译_英语_读音_用法_例句