magic number
noun
1- a figure regarded as significant or momentous in a particular context幻数（在特定情况下被认为具有重大意义的数字）。
1.1
- chiefly Baseball the number which, at a given stage in the season, signifies the combination of wins for the first-placed team and defeats for the second-placed team which will assure the former of championship victory【主棒球】魔机数（赛季中预测得冠军队的胜场数）。