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.
没有人确切的知道奥运会开始于哪一年，但是古代奥运会的历史可以追溯到3000多年以前的古希腊。
Nobody knows exactly that how far back the Olympic Games go, while the history of the ancient Olympic Games can be traced back over 3,000 years to ancient Greece.
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