4周搞定2000+托福核心词
align = ad(去，往) + lign(直线) = 连成一线→使结盟
alignment = a(在...的) + lign(直线) + ment(表名词) = 成一直线
树木中间的线→树带界线，林木线
timberline
常考释义
This rapid zone of transition is called the upper timberline or tree line.
这种快速过渡的区域被称为上行树带界线或林木线。
来源于：阅读OFFICIAL1 P3n. 林线
There is still no universally agreed-on explanation for why there should be such a dramatic cessation of tree growth at the upper timberline.
关于为什么在较高树线处树木迅速停止生长的原因，仍然没有一个一致的解释。
This rapid zone of transition is called the upper timberline or tree line.
这种快速过渡的区域被称为上行树带界线或林木线。
来源于：阅读OFFICIAL1 P3In many semiarid areas there is also a lower timberline where the forest passes into steppe or desert at its lower edge, usually because of a lack of moisture.
在许多干旱的地区存在着下行树带界线，在这里由于缺乏水分森林变成干草原，甚至在最下端会出现沙漠。
来源于：阅读OFFICIAL1 P3The upper timberline, like the snow line, is highest in the tropics and lowest in the Polar Regions.
上行树带界线，和雪线一样，在热带最高，在极地最低。
来源于：阅读OFFICIAL1 P3Timberline trees are normally evergreens, suggesting that these have some advantage over deciduous trees (those that lose their leaves) in the extreme environments of the upper timberline.
树带界线内通常是常绿树，它们和处于上行树带界线处极端恶劣环境中生长的落叶树木相比，具有一定的优势。
来源于：阅读OFFICIAL1 P3There are some areas, however, where broad leaf deciduous trees form the timberline.
然而，在部分地区也有由落叶阔叶林组成的树带界线。
来源于：阅读OFFICIAL1 P3Species of birch, for example, may occur at the timberline in parts of the Himalayas.
例如，在喜马拉雅的部分地区，桦树就在树带界线上。
来源于：阅读OFFICIAL1 P3At the upper timberline the trees begin to become twisted and deformed.
上行树带界线的树木开始扭曲和变形。
来源于：阅读OFFICIAL1 P3Immediately adjacent to the timberline, the tundra consists of a fairly complete cover of low-lying shrubs, herbs, and grasses, while higher up the number and diversity of species decrease until there is much bare ground with occasional mosses and lichens and some prostrate cushion plants.
由于紧挨着树带界线，苔原上都是矮灌木、草本植物和牧草。随着海拔的增加，物种的数量和多样性会逐渐减少，直到出现大量空地伴着零星的苔藓和地衣这样的伏地垫状植物。
来源于：阅读OFFICIAL1 P3以上图片仅供学习交流使用，版权归原作者所有，如有侵权，请与我方联系
