In the early 1980s Ronald McNair helped to lift the racial barrier at NASA's astronaut program.

VOA: standard.2010.02.02

This was the special value that said to the computer string stops here and because you have that barrier given to you at the end of every string, just the most efficient way you can pass strings around is just by passing the address of their very first bytes, the location in RAM.

这是一个特殊的值，表示的是,字符串在这里结束，因为在每个字符串的末尾,都有那个关卡，这是一个最有效率的方式，你可以通过传递,字符串的第一个字节的地址来传递一个字符串，地址是在RAM中的。

哈佛公开课 - 计算机科学课程节选

It's at equilibrium, under the new condition, that is with the barrier removed.

系统在新的状态下处于平衡，这个新的状态就是指隔板被取走了。

麻省理工公开课 - 热力学与动力学课程节选

A state of war can include, in other words, " what we might call a "cold war," two hostile sides looking at each other across a barrier of some type, not clear or not certain what the other will do.

换句话说，战争状态包括，我们所说的“冷战“,敌对双方透过某种屏障,对对方虎视眈眈，却不知道对方会干什么。

耶鲁公开课 - 政治哲学导论课程节选