最好的信号不仅取决于它的亮度，还取决于它与背景的对比度。
The best signal depends not only on its brightness but also on how well it contrasts with the background against which it must be seen.
有几年它的亮度一度达到了现在的太阳亮度的一万倍左右。
For a few years its luminosity flared up to about 10,000 times the present-day luminosity of the Sun.
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