sand expansion

Desertification leads to the formation of drought and lack of rain. Soil erosion and grassland desertification and degradation will continue to cause the expansion of the area of sand region. Desertification is our country is very serious.

荒漠化导致干旱少雨小气候的形成，水土流失、草原沙化退化严重，而且荒漠沙区面积不断扩大。

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Make natural and soft soil knot, adopt beat sand well or plastics catchment plank method for carrying preparing pressings, in soft handle design of the engineering with construction practice, get expansion already and gradually with apply.

使天然软土固结，采用施打砂井或塑料排水板堆载预压的方法，在软基处理工程的设计和施工实践中，已逐步得到推广和应用。

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Therefore, the conservation tillage measures and the arrestment of sand expansion is essential for the prevention and cure of wind erosion and the improvement of Ecological Environment in the area of Xinjiang Production and Construction Corps.

因此，采取保护性耕作措施以及遏制沙地扩张对该地区防治土壤风蚀危害、改善生态环境至关重要。

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Research has believed that veining in admission and exhaust passage of diesel engine cylinder head may mainly be caused by crack of sand core occurring in high temperature phase change expansion.

研究认为，柴油机气缸盖进、排气道脉纹的产生主要是由硅砂高温发生相变膨胀导致砂芯开裂引起的。

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