arctic tree line
常见例句
- A treeless area between the icecap and the tree line of Arctic regions, having a permanently frozen subsoil and supporting low-growing vegetation such as lichens, mosses, and stunted shrubs.
苔原北极地区冰盖和乔本植被线之间的无树地区，有永冻底土，并支撑低的植物，如苔藓、地衣和发育不全的灌木。
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