The hard X-rays more readily penetrate dust and gas clouds in merging galaxies and reveal the presence of emission from the active black holes.

活跃黑洞所发出的硬X射线辐射，可轻易穿透合并星系的尘埃和气体云，因此我们得以见到这些辐射。

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In order to explain the hard X-rays observed in the BH-disc systems, as well as to make our model more self-consistent, corona is introduced in Sec. 3.4.

为了解释各类黑洞吸积盘系统中观测到的硬X射线发射，也为了完善我们的模型，使之更好地解释X射线天文现象，我们在3.4节引入盘冕。

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The aim of the trial was to see if it made the women's breasts easier to examine in mammograms because young women's breast tissue is dense, making it hard for X-rays to pick up tumours.

BBC: Hormone spray 'could stop cancer'