millennium
[名词]
a period of one thousand years, usually calculated from the year of the birth of Jesus Christ

千年, 一千年
age
[名词]
a period of history identified with a particular event

时代, 纪元
Ex: age of agriculture saw the development of farming techniques and settlement growth .
former
[形容词]
referring to the first of two things mentioned

前者, 前的
Ex: After evaluating two investment strategies , they opted for former approach as it promised more consistent returns .
solstice
[名词]
either of the two times of the year when the sun reaches its farthest or closest distance from the equator

至日, 冬至或夏至
civilization
[名词]
a society that has developed its own culture and institutions in a particular period of time or place

文明, 社会
medieval
[形容词]
belonging or related to the Middle Ages, the period in European history from roughly the 5th to the 15th century

中世纪的, 中古的
archive
[名词]
a place or a collection of records or documents of historical importance

档案馆, 档案
Ex: archive of the newspaper provides a valuable resource for studying local history and events .
Common Era
[副词]
used with a date to refer to things happened or existed after the birth of Christ

公元, 公元后

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