文本颜色将根据计算的对比度自动切换（黑色和白色之间）。
The text color will automatically switch (between black and white) according to the calculated contrast ratio.
从视觉上看，它是中性灰，或者是介于黑色和白色之间的一种灰色。
Visually it appears neutral, or a middle gray i. e., halfway between black and white.
对比度：一个比值，如1：1或10,000：1，代表屏幕所能表现出的最亮白色和最深黑色之间的差值。
Contrast ratio: a number ratio resembling 1:1 or 10, 000:1, which illustrates how much difference there is between the brightest whites and the darkest black colors the screen can display.
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