天空因夕阳映照而发红光。

The sky was aglow with the setting sun.

youdao

铁棒加热至发红光。

The iron bar was heated till it glowed.

youdao

到1993年，发光二极管只能发红光、绿光、和黄光。

Until 1993 LEDs could only produce red, green and yellow light.

youdao

到1993年，发光二极管只能发红光、绿光、和黄光。

Until 1993 LEDs could only produce red, green and yellow light.

youdao