Explanation:

(1) [suntan]: the greenish-black color of the skin when exposed to the sun's rays

(2) [dusk]: a deep dark color

3. As opposed to "white" and "fair".

4. Dark mostly describes people with dark skin.

5, network harmonization, equivalent to and black.

Example sentence:

I looked at him carefully:thin face, dark skin, under the light eyebrows, a pair of charitable eyes gleaming. --Zhang Wu, "The Sweeper of Tianyou Peak"