我在西伯利亚南部的游牧民族——以放牧牦牛为生的图瓦人中间做研究时发现，单词也可以固定用在特定的地点。
As I learned working among the Tuvans, nomadic yak herders of South Siberia, words can also be anchored to a specific place.
固定沙丘植物群落退化严重，需要加强保护，控制放牧强度，防止沙丘活化。
The communities of these sand dune-fixed plants suffer severe degeneration and thus need enhanced protection, grazing control and prevention of sand dunes from becoming mobile.
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