在后评估中，“前后对比”(Before and After comparison)是指将项目前期阶段的可行性研究和经济评估的预测结论与项目的实际运行结果相比较，以发现变化分析原因，常用于揭示项目的计划、...
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The second step: smelling The first breath of fresh air, and then probe into the nose cup smell its fragrance, gently shaking the glass, then smell, smell the difference before and after comparison.
先呼吸一口新鲜空气，再把鼻子探入杯中闻它的香味，轻轻摇晃酒杯，再闻，对比前后的香味有何不同。
Comparison of the manifest before and after the conversion.
转化之前和之后声明的比较。
Note that although the example might appear to use double quotes, it actually USES two single quotes before and after the comparison value (" Gold ").
注意，虽然这个例子看上去使用了双引号，但实际上它是在比较值(“ Gold ”)前后使用了两个单引号。
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