一旦他们开始思考如何把自己的抽象设计具体化的时候，他们就会发现自己的设计完全错误。
Once they start thinking about how they're actually going to implement all of these other concretizations of their abstract design, however, it turns out that their design is completely wrong.
利用多媒体教学能把某些抽象问题具体化，把“教”与“学”结合起来。
Meanwhile, the using of multimedia helps students understand some abstract problems more clearly.
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