sand and gravel extraction
常见例句
- 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。 - Major activities in the area are agriculture, forest management, sand and gravel extraction, industry (diverse types), and ecotourism.
UNESCO: EDUCATION 返回 sand and gravel extraction