According to the author, our goal should be______.
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satisfying needs and wants by creating and exchanging goods and value with others.
轻物质与水泥粘结不牢，会降低混凝土的强度和耐久性。()
good deal of our lives is devoted to obtaining what will satisfy by those needs.
建筑装饰工程中常用的石膏品种有建筑石膏、模型石膏、高强石膏和粉刷石膏。()
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