line ·noun (APPROACH)
Definition: a way of dealing with or thinking about something or someone Level: C2
在哲学辩论中，他那种复杂的推理思路让我完全跟不上了。
He lost me with his convoluted ___line ___of reasoning during the philosophy debate.
侦探决定追踪一条新的、有希望的调查线索。
The detective decided to pursue a promising new ___line ___of investigation.
她的论文探讨了一种关于可持续城市设计的非传统思路。
Her essay explores an unconventional ___line ___of thought on sustainable urban design.