closing levee造句

• In chapter 1 , the principle and engineering measures of bringing under control are analyzed at first , the problem of water environment arisen in harnessing closed levees are discussed , too . then present conditions of simulation research on solute movement in groundwater are summarized . in addition , the importance and contents of simulation research on solute movement in groundwater are set forth
  论文第一章绪论部分首先分析了圩区治理的原则与工程措施，其次讨论了圩区治理中出现的水环境问题，后在此基础上对国内外地下水溶质运移模拟研究现状进行了概括，并阐述了地下水溶质运移模拟研究的重要意义与内容，最后论述了本研究课题的提出。