Yet, each year millions of Americans strive for that perfect tan and even spend their hard earned money to purposefully expose themselves to artificial sources of ultraviolet radiation.
然而，每年都有数百万计的美国人为完美的棕色皮肤奋斗，甚至用他们辛苦挣来的钱让他们暴露于人工的紫外线辐射源。
A software package for fast computation of electromagnetic scattering and radiation characteristics of large complex perfect conducting object is introduced in this paper.
介绍了一种可用以快速计算任意形状的电大尺寸导体目标散射和辐射特性的软件包。
In contrast to the mechanism of conduction and convection , radiation may take place in a perfect vacuum.
与传导和对流的原理不同，辐射可在完全真空中进行。
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