Modifier + 清
清 (qīng) is an adjective meaning "clear," "pure," or "clean." It is often combined with other characters to form compound words describing clarity or purity. For example, 高清 means "high-definition" (literally "high clarity").
湖水很清,能看到水底的石头。
Hú shuǐ hěn qīng, néng kàn dào shuǐ dǐ de shítou.
The lake water is very clear; you can see the stones at the bottom.
他把事情解释得很清楚。
Tā bǎ shìqíng jiěshì de hěn qīngchǔ.
He explained the matter very clearly.
这张照片是高清的,细节非常清晰。
Zhè zhāng zhàopiàn shì gāoqīng de, xìjié fēicháng qīngxī.
This photo is high-definition; the details are very clear.