计算机体层成像原理。
题型：问答题 简答题
问题：
计算机体层成像原理。
题型：问答题 简答题
开放作文。
请根据下面提示，写一篇短文。词数不少于50。
In your spoken English class, your teacher shows you the following picture. You are asked to describe
the picture and explain how you understand it.
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