There's an expression an " iron law."

有一种说法是“铁律” 。

He called it the iron law of oligarchy.

他称之为寡头统治的铁律。

An " iron law" is a principle or an idea that cannot be denied – that you, in a sense, can't break.

“铁律” 是一种不可否认的原则或想法——从某种意义上说， 你无法打破。

These data led Flyvbjerg to establish what he calls " the iron law of megaprojects." Over budget, over time, under benefits, over and over again.

这些数据促使 Flyvbjerg 建立了他所说的“大型项目的铁律”。超出预算，随着时间的推移，福利不足，一遍又一遍。

This is pretty much the iron law of memorization