Red, yellow and orange are considered warm colors whereas blue, green and violet are considered cool colors.

红色、黄色和橙色称为暖色而蓝色、绿色和紫色称为冷色。

youdao

youdao

The room was decorated in warm shades of red and orange.

这房间是用红和橙这些暖色调装饰的。

《牛津词典》

Then he bought a black tuxedo suit for the theater, a warm winter coat, a red bathrobe, and the finest silk underclothes.

VOA: special.2009.04.11

Likewise, when it's time to get some shut-eye, a warm red tone that promotes sleep can be dialled in.

ENGADGET: Alt-week 12.08.12: The oldest known dinosaur, lighting up a space station and the black marble

Marine biologists say the most likely cause of the unusual occurance is red algae and the recent warm spell - although mass suicide has not been ruled as a cause.

BBC: News | Wales | Sea urchins may have committed suicide

On the other side of the north Pacific, temperatures are warm (shown in red and white) and sea levels remain high at four to 13 inches above normal.

CNN: satellite image