Two-and-one-half minutes after the Apollo Eleven launch, the first-stage rocket separated from the spacecraft.

VOA: special.2009.07.15

What's a physical mechanism that could lead to differences between these two cells at this very early stage of development?

什么样的生理机制导致细胞,在发育伊始就产生这些差异

耶鲁公开课 - 生物医学工程探索课程节选

When these two merges are done, we're basically at a stage in that branch where we can now merge those two together, which gives us that, and it goes through the rest of it.

拿到从那边得到的第二个子列表，这是一个基本情况,合并它，当这两个合并完成后，我们基本到了该分支阶段，这里我们可以把两个合并在一起。

麻省理工公开课 - 计算机科学及编程导论课程节选

The top two teams in each group move on to the second stage.

VOA: special.2010.06.09

Let's assume that I could somehow get to the stage where I've got two sorted lists.

让我们来假设目前的情况是：,我已经有两个已排好序的列表。

麻省理工公开课 - 计算机科学及编程导论课程节选

She had to be led off the stage after singing two songs.

VOA: special.2010.02.28

This would involve a two-stage interceptor that is scheduled to be flight tested three times between now and the end of 2011.

VOA: standard.2009.07.15

He adds that the newer version has a shorter launch time, better deterrent capability, and that it is a two-stage rocket using solid fuel that is highly maneuverable.

VOA: standard.2009.12.18