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A dam is a structure built across a stream, river or estuary to retain water; Some dams are tall or thin,while others are short and thick. Dams are made from a variety of materials such as rock, stell and wood.
Dams affect society in many positive ways.
Dams gather drinking water for people. Dams help farmers bring water to their farms. Dams help create power and electricity from water.Dams keep areas from flooding. Dams create lakes for peaple to swim in and sail on. Dams also aid in navigation by making waters deep and calmer.
words:
intraduction 介绍 dam 水坝 structure 结构、建筑物 estuary 河(江)口
retain 储备、保留 stell 钢材 positive 积极的 navigation 航行
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