...，且... is a formal additive connector meaning and moreover / and at the same time. It adds another point with compact written style.
Additive linkage - second clause reinforces or extends first
Formal register - common in written or analytical contexts
Parallel logic - both clauses should be semantically connected
See examples below for varied real-world usage.
Use in relatively formal contexts
- Casual speech often prefers 而且/還.
Keep clause relation tight
- Avoid unrelated second clause.
Maintain parallel sentence rhythm
- Improves readability and precision.
The plan has low cost, and execution efficiency is high.
He prepared well, and expressed himself clearly.
This method is simple to operate, and easy to maintain.
The data is complete, and traceable.
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