一來(是)...二來(是)... presents two reasons in ranked explanatory format: first..., second....
Reason structuring frame - organizes multi-cause explanation
Argument clarity enhancer - improves persuasive sequencing
Balanced rhetorical style - concise and analytical
See examples below for varied real-world usage.
Both reasons should be substantive
- Avoid trivial filler in either slot.
Keep first and second reasons parallel
- Improves readability.
Order can imply priority
- Place stronger reason strategically.
I chose this plan: first cost is low, second risk is small.
He is worth hiring: first experienced, second learns quickly.
This delay happened because first requirements changed, second resources were insufficient.
We run internal test first: first controllable, second faster fixes.
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