1·However, when irrigation application decreased by 25% the salt accumulation in root zone will not be obvious and the subsurface drainage flow will decrease by 31.4%.
现状灌溉用水量减少25%时，作物根区没有产生明显的积盐，地下排水量减少31.4%。
2·Subsurface pipe drainage in drought-prone region is superior to surface drainage in draining off water and salt, controlling ground water-level, and increasing crop output, etc.
以明沟排水为对照，论述了内陆干旱重盐碱区暗管排水在排水排盐、控制地下水位、提高土壤脱盐效果及提高作物产量等方面的优越性。
3·Both the surface drainage and subsurface fault-block oil reservoirs in Subei (northern Jiangsu) oilfield are very complicated.
江苏油田地表水系发达，地下断块油藏错综复杂，属于典型的断块小油气藏发育区。
4·The subsurface pipe drainage came into being just in the metaphase of20th century. It was broadly applied in USA, Japan and Egypt for30 ~ 40years.
暗管排水在20世纪中期初步形成，近30 ~ 40年在美国、日本、埃及等国家得到广泛应用。