D This distance I will measure for you, d.
下面我来为大家测量一下距离。
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。
In particular, some upper bounds of the vertex arboricity of the integer distance graph G(Z, D) are obtained when D is a set of positive integers and Z the set of all integers.
特别地，当D是某正整数集合，Z是整数集时，得出了整数距离图G（Z ，D）的点荫度的几个上界。
By the aid of such HOE, the object planes at different distance can be-Imaged into the corresponding channels, Therefore a 3-D object field may be displayed by many 2-D images.
它可以把物方空间沿光轴方向上的不同物距上的物面分别成像在对应的通道上，从而把一个三维物场变为多个二维像进行显示。
The research results indicate that at a distance from the knocked end, the 3-d dispersed wave motion can be described approximately with 1-d fixed shape wave.
研究结果表明，在离开敲击端一定距离后，直管中激励出的三维频散波动可以近似地用一维定型平面波描述。
The research results indicate that at a distance from the knocked end, the 3-d dispersed wave motion can be described approximately with 1-d fixed shape wave.
研究结果表明，在离开敲击端一定距离后，直管中激励出的三维频散波动可以近似地用一维定型平面波描述。
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