sediment

• The problem of determining critical conditions for entrainment of sediment has long been considered .
  确定泥沙起动的临界条件问题已经研究很久了。
• The deposition of sediment in our natural stream channels has greatly aggravated floodwater damages .
  泥沙淤积在天然河道，已大大加剧了洪水的危害。
• The deposition of sediment in channels decreases the channel capacity and the flood-carrying capacity .
  泥沙淤积在河道内，减少了河槽容量和泄洪能力。
• Celestite is usually diagenetic but commonly forms very early in the history of the sediment .
  天青石一般是成岩期的，但通常是在沉积史的极早期形成的。
• These wastes are sluiced directly into streams, they may create severe downstream sediment damages .
  这些废料直接排入河流，可以引起严重的下游泥沙危害。
• In the determination of the inorganic constituents of the sediment there are two ways to look upon the analysis .
  对沉积物中无机成分的测定有两种分析方法。
• Extraction of humic substances from sediments is often the first task that confronts the investigator .
  从沉积物中萃取腐植物是研究工作者遇到的第一个问题。
• Many problems in sediment engineering involve dealing with river valley deposits as a whole .
  泥沙工程中的许多问题都把河流的河谷沉积物作为一个整体来研究。
• Carbonate sediments in all environments are basically products of an ancient biochemical system .
  一切环境的碳酸盐沉积物，基本上都是古代生物化学体系的产物。
• The bottle should not be allowed to touch the bottom in the sampling to avoid stirring up the sediment .
  为了避免在采样过程中搅起沉积物质，瓶子不得接触水底。