- with irrefutable evidence
- 凿凿: true; certain; verified
- 有: 5年 fifteen years
- 据: occupy; seize
- 凿凿: [书面语] true; certain; verified 言之凿凿 say sth. with certainty; 凿凿有据 with irrefutable evidence; supported by irrefutable evidence
- 凿凿者: chipper
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