A recurring theme among those planning to take part is unity across sectarian lines.

VOA: standard.2009.10.25

Already from the very opening lines we see in this a clue to the theme that is going to follow.

打从一开始,我们即看出这条线索,连系到即将发生的主题。

耶鲁公开课 - 政治哲学导论课程节选

How many lines--first of all, where has the melody gone--the theme?

有多少条旋律线,首先,这段旋律去了哪里

耶鲁公开课 - 聆听音乐课程节选