This rapid zone of transition is called the upper timberline or tree line.
这种快速的过渡地带被称为“上树带线”或“林木线”。
2
Above the tree line there is a zone that is generally called alpine tundra.
林木线上方有一个区域，通常被称为高山苔原。
3
Concentrative sections of production, trade and living will be set up in the new zone, representing the tree major functions of industrial production, commercial and trade services and habitation.