Besides the storm tide impact, the main causes for coastal erosion are due to the continued decrease of material supply and manualextraction 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。
2
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。
3
Based on manual definition of templates and rules, it aims at precise sentence extraction rather than wide recall.