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

Winthrop (population 394), made over with a Wild West theme in the 1970s, is a bizarre apparition, especially in the winter when lines of skinny Nordic skis instead of horses stand sentinel outside the storefronts.

BBC: Cross-country skiing in Washington��s Methow Valley

They are present throughout the Yucatan and some have been developed into near-theme parks, where you pay a substantial admission price and there are vehicles, boats, zip lines and more.

CNN: 3 undeniable reasons to explore Mexico