In pre-Classical Greece, for instance, people "corrected" official calendars by shifting dates forward or backward to reflect the change of season.

例如，在前古典时期的希腊，人们通过前后移动日期来“修正”官方日历，以反映季节的变化。

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However it starts with the most pessimistic estimate and then works backward to find a rough guess; and.

然而，这种估算从最悲观的估算开始，然后向后找到一个粗略的猜测。

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He calculated backward to figure out how big an X-ray dose would be needed to get the kind of images the machines produce.

于是他反向推算了一下扫描仪生成符合机场安检要求的图像所需的X射线剂量。

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I bent my head backward to drink in the stars, and clearly I heard a song so sweet and pure I had to hold myself to keep from breaking.

VOA: special.2009.02.14

So use work out of right-hand side to run left-hand backward.

利用右边输出的功,来驱动左边的热机反方向运行。

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

At a minimum, experts say, you should bend over backward to help during the transition.

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Russia, they say, is too big and too backward to be governed exactly like a western country.

ECONOMIST: A survey of Russia: A reconditioned model | The

Tapping once on a book opens it for viewing and you swipe forward or backward to turn pages.

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