By chance, when I got back home, I had an email waiting for me from Mr. Peter E. Sand, director of privacy technology at the US Department of Homeland Security in Washington.
正巧回到家我后收到了一封邮件，来自华盛顿美国国土安全局的隐私保护技术处主任皮特·e·桑德先生。
Many natural phenomena and natural disasters have close relation with granular materials avalanche, i. e. sand dune development and movement, debris flow, snowslide and earthquake.
沙丘发育和前移、泥石流、雪崩、地震等诸多自然现象和自然灾害都与颗粒物质的崩塌有着紧密的联系。
A new way of copper tailings' comprehensive utilization is studied, i. e. use copper tailings to make colour sand, which can be used in buildings as decorated materials.
研究了铜尾矿资源综合利用的新途径，利用铜尾矿研制彩色石英砂，使其成为一种装饰材料应用于建筑工业。
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