在有关粘合问题上的一项早期的决定——油井下只有一根管道，使得天然气和石油抽上变得更容易——附有条件是粘合的时候需要额外小心。

With the centralisers, an earlier decision—to run only one pipe down the well, making it easier for gas and oil to get up—had been taken with the proviso that extra care would be needed in cementing.

youdao

首先，// 意味着从根元素开始选择所有的元素（与后面的选择器及条件匹配）而不论其嵌套的位置。

First, the // means to start at the root and select all elements (that match the selectors and criteria that follow), regardless of where they are nested.

youdao

第三个条件也已经满足了，因为新根的目标父位置就是当前根的父位置。

The third condition is also already satisfied, since the targeted parent of the new root is also the parent of the current root.

youdao

And this was a tube at low pressure.

这是一根低压条件下的试管。

麻省理工公开课 - 固态化学导论课程节选

What makes it true that the person lecturing to you next Tuesday is Shelly Kagan, the very same person, what makes that true is that it's the very same soul.

那个下星期二给你讲课的,还是谢利·凯根,和现在是同一个人，所需要的条件是,有同一个灵魂。

耶鲁公开课 - 死亡课程节选