见wikipedia: Violet color has a predominant light wavelength of roughly 380-450 nanometers Violet (color) Monochromatic violet light cannot be produced by the red-green-blue (RGB) color system)。 …
Webthis guide offers some essential tips for stargazing enthusiasts who want to make the most of their camping trips while also protecting the night sky.
Weba commission that spent nearly two years uncovering france’s role in 1994’s rwandan genocide concluded friday, march 26, 2021 that the country reacted too.