She needs to reach the magic number of 270 votes to win the White House.她需要达到270票的神奇数字才能赢得白宫。
Eighteen holes isn't a magic number for the average golfer.对于普通高尔夫球手来说，十八洞并不是个神奇的数字。
(in baseball棒球)the combined number of wins by the team currently in first place in the league and losses by the team in second place that must be reached for the team in first place to win the title
The Cardinals have won only three of eight, but reduced their magic number for clinching the division to four.红衣主教只赢了八分之三，但由于将分区数缩小到四而减少了魔术数。