On the first day of school, Socrates told his students, "Today, we'll only learn one thing. That is to swing your arm forward and backward."

在开学的第一天，苏格拉底告诉他的学生：“今天，我们只学一件事情。那就是前后摆动你的手臂。”

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Forward and Backward Movements.

前进以及后退。

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Practice moving forward and backward through your slides.

要练习前后移动幻灯片。

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So, you reinforce the pig for walking forward and you punish the pig for walking backward.

那你就对这头猪向前走的行为给予强化,如果它向后退，你就惩罚它。

耶鲁公开课 - 心理学导论课程节选

And now since it's reversible, we can run it forward or backward.

因为它是可逆的，所以可以正方向运行。

麻省理工公开课 - 热力学与动力学课程节选

If that's all it knows, then in that scenario there is no building or anything else; it continues a trajectory both forward in time and backward in time, and it says that whatever seconds, one second before you set your clock to 0, it would've been on the ground.

如果是这样,在那种模式下,没有楼房或者别的什么,物体的运动轨迹可以沿时间可以向后延伸,也可以向前延伸,不管时间取什么值,在零点前一秒时,物体就在地面上

耶鲁公开课 - 基础物理课程节选

In addition to moving the camera left and right, the thumbstick is in charge of making in-game characters walk forward and backward.

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As we wind down for the holidays, and put the first year of Dodd-Frank behind us, now is a great time to look forward and backward.

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While the idea of moving forward and backward in-game with an analog stick on the side of a gun controller seemed unintuitive at first, its execution turned out to be practical.

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