因此，可以通过密度求一个平面物体的质量。

So, you can get the mass of a flat object with density.

youdao

那就把每年的收益率求一个平均数吧。

Let's take the average over all the different years.

youdao

但你们可能也在物理学中见过了，就是求一个给定物体的重心？

But one that you might have seen in physics, we care about maybe where is the center of mass of a given object?

youdao

Who was also one of the word's first programmers. So she was trying to write this program, and it didn't work.

也是世界上最早的几个程序员之一,她正尝试着完成一个,复杂的求反正切的程序。

麻省理工公开课 - 计算机科学及编程导论课程节选

You've got to juggle the two equations, multiply that by 4, multiply that by 3, add and subtract and so on.

同时处理这两个方程,这个两边乘以4,另一个两边乘以3,将两方程相加或相减求出答案

耶鲁公开课 - 基础物理课程节选

First, it's pointing to the beginning of the list, which initially might be down here at but after a while, might be part way through. And to that, I simply add a halfway point, and then I check.

列表中间的一个部分了，然后我求出列表的中值点,然后看看该点的值是不是等于目标值，如果是的话就完成了，如果不是的话，如果中位值大于我要找的目标值。

麻省理工公开课 - 计算机科学及编程导论课程节选