我想他们可能要从边界上的某个基地加油然后发射。

I figure they probably had to refuel and launch from one of these bases that's right on the border.

youdao

这些系统正好处于稳定、有序行为和不可预测的混沌世界（如乱流）之间的边界上。

These systems are right on the boundary between stable, orderly behavior and the unpredictable world of chaos, as exemplified by turbulence.

youdao

边界上已部署了边防岗哨。

Guards have been posted along the border.

《牛津词典》

So, there is that kind of a boundary as well, and that is a place where trouble is likely to emerge.

因此,也有那种边界,而边境线上恰恰是最容易发生争端的地方

耶鲁公开课 - 古希腊历史简介课程节选

for instance, for the thermos with the coffee in if you place the boundary in the inside wall of the glass or the outside wall of the glass and the inside of the thermos, that makes a difference; different heat capacity, etcetera.

比如说，对于装咖啡的热水瓶来说,你把边界设置在瓶胆的内壁上,或者设置在瓶胆外壁上,或设在热水瓶里面，情况都是不一样的;,有不同的热容等等。

麻省理工公开课 - 热力学与动力学课程节选

Doesn't need to be, so, what should I do about the upper bound here?

不必改下边界值，因此,我该对上边界值做个怎么样的改动呢？

麻省理工公开课 - 计算机科学及编程导论课程节选