Ancient Book Restorer: A Lifelong Commitment to Preserving Cultural Treasures
Yes, the two 'but' in the sentence are appropriate. The first 'but' introduces a contrast between the number of years Song has been working and the way she and her colleagues view their work as a lifelong commitment. The second 'but' shows a contrast between the technical aspect of their work and the emotional investment they have in preserving cultural relics.
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