In arid regions, the water tables remain at a constant level far below the surface, preventing stream-beds from filling up even during wet years.后半句表示预防河床被充满还是不被充满？
In arid regions, the water tables remain at a constant level far below the surface, preventing stream-beds from filling up even during wet years.
后半句表示预防河床被充满还是不被充满？
回答如下：
参考译文：在干旱区域，地下水位仍然维持（处于）在一个远低于表面的的恒定水准，预防河床被充满/注满.甚至是在多雨是那一年的。
water tables n.地下水位，承雨线脚;地下水面
constant level 常液面，恒定水准
far below远低于
stream -bed河床
fill up（使）充满；补；垫；填充
arid region干旱区域
句子语法结构剖析如下：
地址状语：in arid regions
主语：water tables
系动词：remain
表语：at a constant level far below the surface
状语：prevent steam-beds from filling up
事件状语：even during wet years
重点短语总结如下：
【1】water tables n. 地下水位，承雨线脚; 地下水面
【2】constant level 常液面，恒定水准
【2】remain at 维持;继续;持续/留在，停留于
【3】far below远低于
【4】stream bed河床
【5】fill up（使）充满；补；垫；填充
【6】arid region干旱区域
【1】water tables n. 地下水位，承雨线脚;
Below thewater tableis the zone of saturation.
潜水面以下就是饱水带。
Thewater tablehas been lowered by drought.
因为天旱，地下水位减少了。
Just above thewater table, the pores are practically saturated.
稍高出潜水面的孔隙事实上是饱和的。
The saturated zone is bounded above by awater table.
饱和带的上界面为潜水面。
Water tableis a surface on which the presure is atmospheric.
潜水面是一个其表面上重压等于大方重压的面。
This lowers thewater tableand reduces soil alkalinization.
这能减少水位，降低土壤的碱份。
【2】constant level 常液面，恒定水准
In actual operation, the fuel is kept at an almostconstant level.
在实质运行中，燃料几乎维持在肯定的水平上。
A container designed for storing cigars or other tobacco products at aconstant levelof humidity.
保湿盒一种盒子，用于在一个稳定湿度下保存雪茄或其它烟草制品
【2】remain at 维持;继续;持续/留在，停留于
We must learn to conserve whatremains.
大家需要掌握保存那些剩余的资源。
I didntremainlong in the city.
我没在那个城市逗留很久。
The present international situationremainstense and turbulent.
目前的国际局势依旧紧张动荡。
Most of the unearthed relicsremainintact.
大部分出土文物仍维持完好无损。
【3】far below远低于
He looks down from the TOP of the mountain to the valleyfar below.
他从山顶向下眺望下面幽深的山谷。
Far belowthe plane we could see the lights of London.
从飞机上俯瞰远处可以看到伦敦的万家灯火。
His reputation fallsfar belowhis desert.
他的功劳远高于他的名声。
He looked down at the trafficfar below.
他俯瞰下方远处的行人汽车。
I could still see the airport buildingsfar below.
我还能远远地看到下方的机场建筑。
His attainments arefar belowhis brothers.
他的收获远不如他的兄弟。
【4】arid region干旱区域
Groundwater has very important eco-value in arid and 百度竞价推广i-arid regions.
摘要干旱半干旱区域地下水具备要紧的生态价值。
The farms offer a model for otherarid regionsthat want to grow their own crops as food prices continue to rise globally.
伴随全球食品价格持续走高，农场为其他想要自己种植作物的干旱区域提供了模板。
