The only reason high school students learn is to ace the test. As soon as we step out of the classroom, we dump the information to create space. We then repeat the process.

中学生学习的唯一动因就是在考试中拔得头筹，但是一旦我们一脚踏出教室，便立刻将所学知识扔到脑后，来给大脑腾出空间，然后我们再重复这一程序。

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In this paper, after introducing MIMO information theory about sp ace time code, three kinds of space time code are compared and analyzed systematically.

在介绍空时码的MIMO信息论基础上，系统地对三类空时码进行了分析比较。

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