在你演说的空间里改变你的活动区域例如：从教室的前方走向后方。
Change the location of the room that you present from eg: from the front to the back.
向前向后方法是模型论及其应用研究中的一个新的工具。
Back and forth method is a new tool in study of model theory and its application.
那么停止打腿后伸展你的脚踝把脚指向后方会发生什么呢？
So what happens when you stop kicking and point your feet toward the wall by stretching your ankles?
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