随着我国经济步入“快车道”，工业化与城市化进程加快，从而导致对土地的过量需求。
With the Chinese economy into the "fast lane", and the speeding up of industrialization and urbanization, the demand for land is getting greater and greater.
长期过量灌溉引起了该地区土地的盐碱化。
Long time excessive irrigation has caused secondary salinity problem.
当水流过量或者淹没正常的土地时，洪水发生。
A flood occurs when overflows or inundates land that's normally dry.
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