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1·Shrub expansion has occurred in other environments, like semiarid grassland, and tall grass prairies.

灌木的扩张也发生在其他环境中，比如半干旱草原和高草草原。

2·The raising of livestock is a major economic activity in semiarid lands, where grasses are generally the dominant type of natural vegetation.

在半干旱地区，草地通常是最主要的天然植被，而该地区主要的经济活动是家畜饲养。

3·In arid and semiarid regions, on the other hand, the small number of lakes and the great distances between them reduce the possibilities for correlation.

另一方面，在干旱和半干旱地区，湖泊数量少，湖泊之间距离远，减少了相互关联的可能性。

4·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.

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。

5·The semiarid lands bordering the deserts exist in a delicate ecological balance and are limited in their potential to adjust to increased environmental pressures.

沙漠边缘的半干旱土地处于非常脆弱的生态平衡之中，而这些半干旱区域对于持续增加的环境压力的适应能力极其有限。

6·The southern frontier of the desert was far to the north of where it is now, while semiarid grassland and shallow freshwater lakes covered much of what are now arid plains.

过往沙漠的南部边界比现在的边界更靠北，而半干旱的草原和较浅的淡水湖泊覆盖了现在干旱平原的大部分地区。

7·The fact that lake levels in the semiarid southwestern United States appear to have been higher during the last ice age than they are now was at one time attributed to increased precipitation.

美国西南部半干旱地区的湖泊水位在上一个冰河时代似乎比现在更高，这一事实曾一度归因于降水增加。

8·The region is semiarid to arid in overall climate.

这个地区总体上是半干旱至干旱气候。

9·The region is semiarid to arid in overall climate .

这个地区总体上是半干旱至干旱气候。

10·North China is situated in arid and semiarid regions.

华北地区位于干旱和半干旱地区。

(1)semiarid climate[地理]半干旱气候；草原气候