这部电影有三条平行发展的剧情线索。

The movie has three parallel ___strands of storyline developing simultaneously.

她小心地摘掉了毛衣上的几根散线。

She carefully removed a few loose ___strands from her sweater.

这个复杂问题可以分为三个主要方面来分析。

This complex issue can be divided into three main ___strands for analysis.