dì / sì / jì / yǐ / lái / dì / qiú / jīng / lì / le / duō / cì / bīng / qī / hé / jiān / bīng / qī

第四纪以来，地球经历了多次冰期和间冰期。

Since the Quaternary period, Earth has experienced several glacial and interglacial periods.