The mold is made of small squares of wire that hold the shape and thickness of the paper.

VOA: special.2009.07.06

So if we want to talk about the volume of that, we just talk about the surface area, which is 4 pi r squared, and we multiply that by the thickness d r.

如果我们要讨论它的体积，我们要用的是表面面积，也就是４πｒ的平方，乘以厚度ｄｒ

麻省理工公开课 - 化学原理课程节选

r And what that is the probability of finding an electron in some shell where we define the thickness as d r, some distance, r, from the nucleus.

在某个位置为,厚度为dr的壳层内,找到原子,的概率，我们来考虑下我们这里所说的。

麻省理工公开课 - 化学原理课程节选

The amount of ice cover and its thickness are two measures of the health of the Arctic Sea.

VOA: special.2009.05.05

a perfectly spherical shell dr at some distance, thickness, d r, dr we talk about it as 4 pi r squared d r, so we just multiply that by the probability density.

在某个地方的完美球型壳层,厚度，我们把它叫做4πr平方，我们仅仅是把它,乘以概率密度。

麻省理工公开课 - 化学原理课程节选

The signs include a skin growth that changes in size,color, thickness or texture.

VOA: special.2010.07.06

Pig blood is very close in thickness to human blood.

VOA: special.2010.05.05

Under his expert hands, paper of almost any type, stiffness or thickness can be turned into a work of art.

VOA: standard.2010.03.17

They also did ultrasound and other tests to measure blood vessel function and the thickness of the artery wall.

VOA: standard.2010.03.04

"You know the thickness, tolerances of wood has to be exactly right for the right tone, and volume of a soundboard has to be measured exactly, and that's done mostly by ear.

VOA: standard.2010.07.06