Expression must clear thinking, logic clear.

表述一定要思维清晰，逻辑清楚。

youdao

Now, "there's not a clear logic or rationale for her candidacy, " Harris says.

NPR: Analysis: Clinton Lacks Clear Path to Victory

But they have a clear political logic.

ECONOMIST: The 110th Congress

As the late, great economist Julian Simon demonstrated (both with clear economic logic and an unassailable mountain of data), there is a long-run tendency for standards of living to improve and for material scarcity to relax as a constraint rather than tighten.

FORBES: You Worry. You Shouldn't. Part 1: Overpopulation and Resource Exhaustion