Just as a keystone holds together a stone arch, Pennsylvania was seen as holding together the young American republic.

VOA: special.2009.08.23

That is a maximum If you are sharing your time and energy during this period on Tuesday afternoons, or the arch-field don't work so think carefully about that.

让大家充分发挥自己的能力,如果每周二下午这段时间,你都有时间，精力也很充沛，就可以来上这门课，不过这样你就没时间参加实践活动了,所以请仔细考虑吧。

麻省理工公开课 - 电影哲学课程节选

I think a lot of us, we do what we can in this lifetime, hoping that we're are part of a long trajectory of a moral arch toward justice What would like to see in America in 20 years?

我认为我们之中很多人在一生中会竭力奋斗，希望我们能够沿着道德，正义的,的轨迹发展,您如何构想美国20年后的情景呢？

普林斯顿公开课 - 人性课程节选

Later a transport system was added to permit people to visit an observation area inside the top of the arch.

VOA: special.2009.03.04

..I have kept hidden in the instep arch Of an old cedar at the waterside A broken drinking goblet like the Grail Under a spell so the wrong ones can't find it, So can't get saved as Saint Mark says they mustn't.

我还保存着一只坏了的高脚酒杯,埋在水边的一棵老树底下,像受了符咒的圣杯,使坏人找不到，如圣马可所说：他们因此不能得救。

耶鲁公开课 - 现代诗歌课程节选

Earlier this year, Tehran's arch-enemy Israel test fired its own Arrow 2 missile in a simulation of stopping the Shahab-3.

VOA: standard.2009.09.28

The arch has a cable car that takes visitors to the top for breathtaking views of the city and the ocean.

VOA: standard.2010.02.10

But in his conciliatory mood Saturday, Mr.Ravalomanana suggested he would not object to a constitutional change that would allow his arch-rival to seek the presidency.

VOA: standard.2009.11.08