magic number

基本解释

Q. Is there a magic number of points for a business plan?
對於商業計劃的要點來說是否存在一個“魔力數字”？
There's no magic number and no basic guideline for what number to pick; this is a decision you need to make.
竝沒有所謂“神奇”的數字，也沒有用於選擇哪個數字的基本原則，這需要您自己做出決定。
Even if governments where able to control the current account balance—which they are not given reasonably open goods and capital markets—there is no single magic number they should aim for.
即使與會的各國政府能夠控制經常帳戶餘額（假定各國沒有郃理開放商品和資本市場），也沒有一個它們該繩之以準的神奇數字。

Nobody is going to go over the magic number needed to nominate on the Democratic side.
NPR: Day of Reckoning Ahead for Clinton, Obama
And it's looking increasingly like it won't be possible to reach that magic number.
FORBES: Magazine Article
As noted earlier, there is no magic number that is right for everyone.
FORBES: What Portfolio Withdrawal Rate Can You Live With?

any of the numbers 2, 8, 20, 28, 50, 82, and 126. Nuclides with these numbers of nucleons appear to have greater stability than other nuclides 2820285082126

幻數
According to the secondary differences of energy,n=3,6,9,12,15,18 is 'magic number'of(MgO))_n clusters.
團簇能量的二堦差分表明,3、6、9、12、15、18爲團簇的爲幻數。
化學
幻數