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。
The extraction of keywords would have been a manual process, their selection entirely at the mercy of the person performing it.
关键字的提取将是一个手动进程，关键字的选择完全取决于执行选择的人。
Based on manual definition of templates and rules, it aims at precise sentence extraction rather than wide recall.
基于模板和规则的人工定义，它旨在准确的句子提取，而非广泛地检索。
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