1846年，就俄勒冈区域界限的争议与英国达成一致。

In 1846, the boundary dispute with Great Britain over the Oregon Territory was finally settled.

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然而，阿德霍尔德的信并没有给家人带来团聚，而是揭示了该地区存在的一种分歧。该地区有9700名学生，而且基本上是按种族界限划分的这个区域。

But instead of bringing families together, Aderhold's letter revealed a divide in the district, which has 9,700 students, and one that broke down roughly along racial lines.

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在许多半干旱的地区中，同样存在树带界限的下限区域；在这片区域之内，由于缺乏水分，森林下沿区域的植被通常会逐渐变成干草原或沙漠。

In 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.

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