First let me back up a bit and talk about vision correction before the printing press.

让我先回顾下在印刷术之前的视力矫正是什么样的。

youdao

Last year, they finally let me back in.

去年，他们终于重新接受了我。

youdao

Actually, let me back up and do this in video.

实际上，让我们倒退下然后在录像里做这个。

youdao

"Let me get back to you on that. Oh,oh,oh -- in college, the boyfriend who absolutely forgot Valentine's Day.

VOA: special.2010.02.08

Again, you have to let me back up slightly and set the stage.

怎么去写代码,让我准备准备。

麻省理工公开课 - 计算机科学及编程导论课程节选

Actually, let me back up and do this in video.

实际上，让我们倒退下然后在录像里做这个。

麻省理工公开课 - 计算机科学及编程导论课程节选

But let me back up a bit.

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Let me back up and elaborate.

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Let me go back to your question and share with you from my perspective.

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