From the tragedy in Moscow's subway, to the 2004 Madrid train bombings and the explosions in London's public transit system the following year, experts say no country is immune to terrorism.

VOA: standard.2010.03.30

Again, I don't have data to back this up, but just common sense suggests to me that the common case is if I'm on the subway platform I want to get on that train and maybe I want to get back and where are those two buttons, right?

此外，我没有数据来备份这个，但是常识告诉我，常见的情况是,如果我站在地铁站台上，我想乘上地铁,可能我还想回来,那么哪里能找到这两个按钮，对不？

哈佛公开课 - 计算机科学课程节选

If you're riding on a subway, a crowded train, and you wish to speak to your neighbor,

如果你正在乘地铁，车厢里很是拥挤，你想跟你的邻座说说话，

Can 课堂 - SpeakingMax英语口语达人