The simplest form of dynamic UI is one that grays out menu items or buttons that are unavailable.
动态 UI 的最简单形式是使不可用的菜单项或按钮变灰的 UI。
But modern ufologists are more or less informed about the Grays already.
但其实现代的不明飞行物研究者或多或少已经证实了灰人的存在。
Designating color perceived to have zero saturation and therefore no hue, such as neutral grays, white, or black.
无色的无色的，因零饱和度而没有颜色，如中性灰色，白色，或黑色。
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