儒略历在公元前45年开始被使用，它是被凯撒大帝改良的罗马历。

The Julian calendar began in 45 BC as a reform of the Roman calendar by Julius Caesar.

youdao

儒略历在公元前45年开始被使用，它是被凯撒大帝改良的罗马历。

The Julian calendar began in 45 BC as a reform of the Roman calendar by Julius Caesar.

youdao