sand and gravel extraction

常见例句

双语例句

• Besides the storm tide impact, the main causes for coastal erosion are due to the continued decrease of material supply and manual extraction of sand and gravel.
  海岸侵蚀的原因除风暴潮影响外，主要是海岸带物质补给来源持续减少和人工采挖砂石。
  journal.geomech.ac.cn
• The variations of flow pattern cause headwater erosion, and the sand gravel extraction will result in comprehensive adjustment of riverbed , affecting riverbed stability.
  水流流态变化引起溯源冲刷，进而导致河床全面调整，影响河床稳定。

权威例句

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