The Tertiary Period was separated into division of time that were equal in length.
第三纪被划分为等长的时间单位。
Time division. It can take 6 to 9 as a 1 minute central. High point to 6 as down period.
这时候的划分。就可以把6到9当做1分钟中枢。高点到6当做下跌段。
Chapter II - the division of land use database for county establishment period.
第二部分对县级土地利用数据库的建设时期进行了划分。
County as an administrative division originated in the Spring and Autumn Period.
县域始于春秋时期，是国家行政区划的基本单位。
County as an administrative division originated in the Spring and Autumn Period.
县域始于春秋时期，是国家行政区划的基本单位。
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