Their nomadic trek across 2000 rugged miles is one of the great feats of pre-historical man.
他们横穿2000英里的艰苦跋涉是史前人的伟大壮举之一。
2
As to the pre-historical history, we are especially not to view it with the prejudice of civilizations to the extent to distort the humanity phenomena before the maturity of the writing.
具体到史前史，我们尤其不能带着文明的偏见，歪曲文字成熟以前的种种人文现象。
3
In 2010, the total trade volume among the three countries exceeded the pre financial crisis level and their personnel exchanges hit another historical high.