electron-density section 电子密度切面
This section of the course develops the mathematical concepts used in statistics. Three ideas are essential: Random Variable, Density Functions, and Expectations.
此部分课程扩展了统计学中的基本数学概念。三个基本想法如下：随机变数，密度函数与期望。
It is made clear in the third section that the density distributions of visible matter and invisible matter are quite different from each other.
在第三节中我们指明，可视物质和不可视物质的密度分布是十分不同的。
With increase of heat input and laser power density, the cross section of the weld transformed from nail shape to near X shape.
随焊接热输入和激光功率密度的增大，焊缝截面由钉形向近X形转变。
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