Yak conveyance from Lhas to Yaan was only once a year.
从拉萨到雅安的牦牛运输, 一年只能往返一次。
After lunch, we drove to the Yaan City, not far from the Bi Fengxia.
吃过午饭, 我们驱车来到离雅安城不远的碧峰峡。
The Study on the Geologic Specific Property and the Engineering Measures of the Gravel Layers in Area of YaAn
雅安砾石层工程地质特性及工程措施研究
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