I'm sure you remember some of the simpler rules for differentiation and could quickly tell me that the derivative of x2 is 2x.

我确信你们仍然记得一些简单的规则，并且能够迅速地告诉我x2的导数是2x。

youdao

Despite a country founded by risk-takers, our schools are the antithesis of American culture--bound by arcane rules, operating regardless of outcomes, eschewing creative technologies and managing human resources like spokes in a wheel, without differentiation or reward.

FORBES: 01.24.08, 6:38 PM ET