第一要义就是差异(对比)：链接要足够暗(或者亮)以和背景色相对照。

The first consideration is contrast: links have to be dark (or light) enough to contrast with the background color.

youdao

我的车窗颜色不会比法律允许的暗，足够用以保护太阳光就行了。

My car's window tinted no darker than the law limited, just enough to protect the sun light.

youdao

夕阳西下，天色很快暗下来，但是还有足够的光线。

The sun was setting fast, but there was still ample light.

youdao