课题小组选择了140个活动星系核，或简称agns，这些星系都放射出大量的X射线，X射线能穿透阻挡观测的气体和尘埃。
The team chose 140 active galactic nuclei, or AGNs, by selecting galaxies that emit a lot of X-rays, which can Pierce the galactic gas and dust that might otherwise block the nuclei from view.
为了同时兼顾穿透深度、成像对比度和信噪比三方面的需要，选择微波辐照频率时应该采取折中选取的原则。
As for the choice of the microwave irradiation frequency, the trade-off must be made in order to insure the penetration depth of the microwave signal, imaging contrast and signal-to-noise ratio.
在工业CT设计中，为了选择闪烁体的种类和几何尺寸，需要知道韧致辐射光子穿透闪烁体的能量和通量分布。
In the design of industrial ct, the knowledge of energy and flux distributions for bremsstrahlung photons through crystals is necessary to select scintillator's type and dimension.
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