事实上，这里有两个时期的降雨和湖泊形成：第一个始于大约37000年前；而第二个可以追溯到约一万年前。
There were actually two periods of rain and lake formation: the first one began about 37,000 years ago; and the second one dates from about 10,000 years ago.
对史前史进行定义需要追溯到人类有文字记录之前。历史始于文字记录。
The definition of prehistory is that it predates written records - history begins with the written word.
大家普遍认同的新年指的是春节因为它始于春分(二十四节气中最早的一个节气)它的起源年代久远而无从追溯。
The Chinese New Year is now popularly known as the Spring Festival because it starts from the Begining of Spring (the first of the twenty-four terms in coodination with the changes of Nature).
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