公元

公元

"公元" means "Anno Domini" or "Common Era (CE)."

In this sentence, '公元' is used as part of a date expression to indicate the Gregorian calendar year (Anno Domini).

公元2023年是一个值得纪念的年份。

The year 2023 AD is a memorable year.

Here, '公元' is combined with '前' to refer to a date before the Common Era (Before Christ).

这个遗迹可以追溯到公元前500年。

This relic dates back to 500 BC.

In this sentence, '公元' is used to discuss the concept or system of Anno Domini in historical context.

公元的计算方式由西方传入中国。

The method of calculating AD years originated from the West and was introduced into China.