For interval repeats, he runs 12 x 400 meters or 6 x 800 meters at slightly faster than his 5-K race pace.

在平时的间隔训练中，他用比5-K比赛速度稍快的速度跑12个400米或6个800米。

youdao

Or it's 1/2 k x squared.

或者是1/2，k，x的平方。

youdao

The average raw Nano-X app is in 30 to 60 K in size.

原始 Nano-X 应用程序的平均大小在 30 K 到 60 K。

youdao

Mathematically complete problem is that you can find the function x of t by saying that the second derivative of the function is equal to -k over m times the function.

这个数学问题就是,你可以求出函数 x,只要令函数的二阶导数,等于 -k 除以 m 再乘以函数

耶鲁公开课 - 基础物理课程节选