The valley shows substantial evidence of its use as a major trade route over the past 10,000 years.
The valley shows substantial evidence of its use as a major trade route over the past 10,000 years.
这一地区在过去的10，000年中起着主要的贸易通道作用。
The valley shows substantial evidence of its use as a major trade route over the past 10,000 years.
这一地区在过去的10，000年中起着主要的贸易通道作用。