drift sand 是什么意思

	1.	Wind - drift sand hazard in kubuqi desert and its control 库布齐沙漠风沙危害及其治理技术
	2.	The farm was engulfed in drifting sands 该农场被流沙淹没了。
	3.	The constructional technology in tunnel of great section wind drift sand 公路大断面风积砂隧道施工技术
	4.	Construction of vertical shaft passing through drift sand and experience lesson 立井过流砂施工及经验教训
	5.	Study of high - pressure rotary jet grouting in inclined shaft construction crossing through drift sand ground 高压旋喷在斜井井筒过流沙层施工中的技术研究
	6.	The function of desert microbiotic crusts in erdos was analyzed , the results ahowed that : microbiotic crusts consist of fine sand and thick powder sand , but differs with the wind - drift sand , wind - drift sand are coarse sand and fine sand ; microbiotic crusts influence the rainfall distribution again and effect on the evaporation of infiltration moisture ; microbiotic crusts has the power of water conservation and the function of enrichment of nutrients 摘要本文对鄂尔多斯沙漠生物结皮作用进行了初步研究，结果表明结皮层的机械组成以细沙和粗粉沙为主，而流沙以粗沙和细沙为主；生物结皮层影响降水的再分配作用，并影响入渗水的蒸发规律；生物结皮层县有较好的保水特性和养分富集作用。

drift sand是什么意思