它可以防止风沙流向南方肥沃的农田。
It will stop the sand from moving towards the rich farmland in the south.
修筑了土墙和排水沟来防止风沙和水涝。
Walls and drains have been built to keep out sand and water.
这些措施能有效地减小和防止风沙灾害的发生。
And these measurements can effectively reduce and prevent the occurrence of wind and sand damage.
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