既...又/也 means "both...and" - describing two qualities that exist together.
This dish is both delicious and cheap.
Usually describes qualities of the same subject. 又 and 也 are interchangeable.
又 and 也 are interchangeable
- 既好又便宜 = 既好也便宜
Different from 不但...而且
- 既...又 = parallel qualities
- 不但...而且 = escalating emphasis
Same subject for both qualities
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