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

His journey from monstrosity to enlightenment contains no backward steps and, as dramatized by Mr. St.

WSJ: The Road to Redemption | The Best of Enemies | Florida Studio Theatre | Review by Terry Teachout

But this is by no means a backward-looking book.

ECONOMIST: The Irish poet's new collection is his best for years

It's been so many years, in fact, since Allen told us to "go backwards when forward fails" that the notions of forward and backward no longer seem relevant, and neither do any of the standard ways of thinking about art generationally.

WSJ: The Jazz Scene: Easy Keys, Bass Instincts