tundras

1. Bryoflora of the alpine tundra of Changbai Mountain and its floristic relationship to the bryofloras of arctic tundras.
    Title 长白山高山冻原苔藓植物区系及其与北极冻原苔藓植物区系的关系。

2. Treeless regions found in and around the Arctic, tundras are among Earths coldest, harshest biomes.
    这里没有树木生长，因为已经在北极圈周围了，苔原生长在地球的寒冷的、荒芜的生态环境。

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3. The two tremendous continental countries shared a frontier of4, 000 miles in a vast arc from the frozen tundras of Siberia to the stark deserts of Central Asia.
    这两个辽阔的大陆国家的共同边界从西伯利亚冻土地带到中亚细亚荒漠划出一个大弧形，长达四千多英里。