词典释义：
释义
n.
the performance of more work than duty requires
做职责以外的工作，做分外之事。
短语
-
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
词源
"early 16th cent.： from late Latin