...，也就是說... means that is to say / in other words, introducing paraphrase, clarification, or inference reformulation.
Reformulation marker - restates previous point for clarity
Explanatory coherence tool - bridges technical/abstract to clearer phrasing
Argument structure support - helps listener follow reasoning
See examples below for varied real-world usage.
Second clause should paraphrase or infer from first
- Not unrelated addition.
Avoid redundant repetition without added clarity
- Reformulation should improve understanding.
Common in explanatory discourse
- Useful in teaching and meetings.
Costs rose, that is to say profits will decline.
Demand weakened, in other words we need to adjust targets.
This is not temporary, meaning it needs long-term handling.
Failure rate in tests is high, that means process has gaps.
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