研究人员用这些照片来测量老虎脚印的长度和宽度以及脚趾之间的角度，以及10种其他变量来确定不同老虎的“身份”。

The researchers then use the pictures to measure the length and width of each pugmark, the angle between toes, and 10 other variables to establish an ID.

youdao

一个最早的软件物理引擎是ENIAC计算机，用来仿真给定了重量、角度、推力和风速变量的炮弹。

One of the earliest software physics engines was the ENIAC computer, which was used to simulate artillery shells given variables of mass, Angle, propulsion, and wind.

youdao

没错，这种排名不会出现缺乏数据支持的问题---虽然以不同的角度、从不同的国家来收集数据会产生很多变量。

True, there would be no shortage of data, though it would be of variable robustness and gathered on different bases in different countries.

youdao

Covariance is--we'll call it--now we have two random variables, so cov... I'll just talk about it in a sample term.

协方差是...我们有两个随机变量,x和y的协方差是,从样本的角度来说

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So if, in fact, we want to describe a wave function, we know that we need to describe it in terms of all three quantum numbers, and also as a function of our three positional factors, which are r, the radius, phi plus the two angles, theta and phi.

实际上，我们想描述波函数，我们知道我们需要,用这三个量子数来描述它，同样，波函数还是,三个位置变量的函数，它们是r半径，还有两个角度theta和。

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