Now,at last, the two coasts of the United States were united by a single line of metal rail.

VOA: special.2010.02.25

If you look really carefully, you could find it was not a single line but two lines, and Bohr is silent on such matters.

如果你仔细观察的话，会发现这是两条谱线而非一条，对这一研究，波尔不得不沉默。

麻省理工公开课 - 固态化学导论课程节选

So I actually don't need the curly braces because I only have a single line of code.

所以我实际上不需要那个花括号,因为我只有一行代码。

哈佛公开课 - 计算机科学课程节选