淤泥堆积抬高河床，不仅减少大坝使用寿命，而且增加洪水泛滥的可能性。
The resulting silt raises the level of the Yangtze riverbed, not only reducing the life of the dam, but also worsening the risk of floods.
这一现象造成的后果是：在春季，河水流速变快，增加洪水发生的危险；而在夏季，河水流速变慢，即有可能出现旱灾。
The result is that rivers are flowing faster in the spring, raising the risk of flooding, and slower in the summer, raising the risk of drought.
人们需要更多的能源支持更大的城市运转和经济增长，从而导致了水坝的建设，随之而来的生态系统的洪水，以及污染物的排放增加。
The need for more energy to power larger cities and economic growth therein leads to the construction of dams, the consequent flooding of ecosystems, and increased emissions of pollutants.
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