It may also create the greatest trek in Southeast Asia.
这也可能创造出东南亚最大的艰苦跋涉的徒步旅行。
The twice-yearly trek has shaped nomadic life here for centuries.
几个世纪以来，这种每年两次的艰苦跋涉形成了这里的游牧生活。
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。
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