sand and gravel extraction

常见例句

雙語例句

• 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.
  海岸侵蝕的原因除風暴潮影響外，主要是海岸帶物質補給來源持續減少和人工採挖砂石。
  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.
  水流流態變化引起溯源沖刷，進而導致河牀全麪調整，影響河牀穩定。

權威例句

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