By using pot tests, the effect of low-P stress on dark sun-cured tobacco endogenous hormone and root activities were studied during different growth stage.

通过盆栽试验和室内分析，研究低磷胁迫对晒红烟内源激素和根系活力的影响。

youdao

I have a dark sun spot that I used to have to cover with heavy duty concealer.

我有一个晒斑，我以前都需要用很多遮瑕膏来盖。

youdao

This is because lighter colors take in less of the strong heat of the sun than dark colors do.

VOA: special.2009.08.19

Scientists measure solar activity by counting dark areas on the sun's surface.

VOA: special.2009.09.29

Finally,the sun went down, and the battlefield became dark.

VOA: special.2009.09.24

Lino is as thin as a whippet, all sinew and lean muscle, and dark with the sun.

BBC: Sardinia, land and sea

Her usually pale complexion glowed from summer sun, but there were deep, dark lines under her eyes.

NEWYORKER: Changing Times

Perhaps the reason is that those who toiled all day in the fields became dark while the aristocratic elite, protected from the sun, remained pristine white.

BBC: A Point Of View: How China sees a multicultural world