Planning sand extraction scheme in accordance with potential channel change and combining channel modification with sand extraction can improve navigation condition to a certain extent.

科学合理规划采砂方案，顺应河床演变趋势，将整治河道与采砂疏浚河道有机地结合起来，可除害兴利，在一定时期内和一定程度上改善航道条件。

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An LCA tracks, say, a glass jar from the initial extraction of the silica from sand through the 48 hours of cooking at 2, 000 degrees Fahrenheit all the way through its final disposal.

例如，运用LCA技术，可以对一只玻璃瓶的整个生产及使用过程进行追踪，即从其在华氏2000度高温下熔砂48小时提取硅，直至玻璃瓶被用过之后的最后丢弃的全部过程。

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The method of determining the mineral oil content in the oil sand with weight was recommended. As two committed steps, extraction and separation of mineral oil were discussed.

介绍了用重量法测定油砂中矿物油含量的方法，并且对测定的两个关键步骤即油砂中油的萃取以及矿物油的分离进行了重点讨论。

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Unable to stop Canadian oil drilling and tar sand extraction programs, environmental groups are now trying to block any pipeline that is proposed out of the oil producing regions.

FORBES: Keystone XL: Voting for the Stone Age

Major activities in the area are agriculture, forest management, sand and gravel extraction, industry (diverse types), and ecotourism.

UNESCO: EDUCATION