And that's basically trying to make sure our program has not regressed, as to say, gone backwards in how well it works. And so we always test it on everything.

这只是从根本上确保,我们的程序并没往后退，也就是说在可用性方面倒退了,因此我们在任何东西上,都要进行这样的测试。

麻省理工公开课 - 计算机科学及编程导论课程节选

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

In particular, the things that I say are at rest, you will say are moving backwards at the velocity that you have relative to me.

特别是那些在我看来是静止的物体,在你看来却在后退,后退的速度等于我们之间的相对速度

耶鲁公开课 - 基础物理课程节选

Are we all set? Back up.

都就位了,往后退

耶鲁公开课 - 古希腊历史简介课程节选

Haze and the car shot backwards because the man had left it in reverse.

松开刹车，He，took，the，brake，off,那车忽然向后退,因为那男人之前给车挂了倒车档。

耶鲁公开课 - 1945年后的美国小说课程节选

She jumped up and jumped back and started moving papers around and really was giving me this look ?" like "Why don't you just leave?"

她猛地站起来，往后退了一步,赶紧拾掇着桌面上的文件,给了我一个眼神,好像在说“为什么还不滚“

耶鲁公开课 - 心理学导论课程节选