以你们的纪年法，这大约发生在50万年前。

This occurred approximately 500,000 of your years ago.

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也就在那一年，掌管罗马的领导人朱利尤斯•恺撒发明了一种新的纪年法——阳历。

That is when the leader of the Romans - Julius Caesar - took charge and invented a new solar calendar.

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后来人们把这种计时法用于纪年，就出现了十二生肖。

Later, people use this method of time labeling in counting years. This is why we have the Chinese Zodiac.

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后来人们把这种计时法用于纪年，就出现了十二生肖。

Later, people use this method of time labeling in counting years. This is why we have the Chinese Zodiac.

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