有各种原因造成的土地干旱退化，半干旱和干燥低湿地区。比如，气候变化和人类活动所致。

Land degradation in arid, semi-arid and dry sub-humid areas resulting from various factors, including climate variations and human activities.

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这场攻击仅发生在5个月前，可是低湿地周围的杂草和灌木正在覆盖一个幸福家庭生活的最后一丝遗迹。

The attack happened only five months ago, but already the weeds and brush of the surrounding swampland are covering the last traces of a happy family life.

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结果表明：该地区低湿地草甸草场单位面积产草量最高，牧草质量好，但仅占总土地面积的0 .5 %左右，只能作为辅助草场；

The results show that the average yield of bottom wetland grassland is the highest, with good quality but its area is about 0.5% of the total area, it can only be taken as accessorial grassland.

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