the performance of more work than duty requires
做职责以外的工作,做分外之事。
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works of supererogation (in the Roman Catholic Church) actions believed to form a reserve fund of merit that can be drawn on by prayer in favour of sinners (罗马天主教的)赎罪行为,祈祷者为罪人行善赎罪
"early 16th cent.: from late Latin