Pollutionin Mexico City used to be so bad that children painting pictures of the sky reportedly would color it gray, not blue.

墨西哥城以往的污染特别严重，据说孩子们在给天空画画时会把天空描绘成灰色的，而不是蓝色的。

youdao

While its six-inch screen is the same size as the former model and still cannot render color, it will now display16 shades of gray, versus 4 in the original.

它拥有与前一代一样的6英寸显示屏，也仍然不支持彩色渲染，它现在采用的是16色灰和4原色。

youdao

The salt prevents the meat from turning an unattractive gray color as it ages, slows the fat from spoiling and inhibits bacteria from forming.

盐能防止肉变成灰色，看上去不鲜艳，防止脂肪变质，抑制细菌生成。

youdao

The men knew it was the middle of the day because the color of the sea changed from slate gray to emerald green, with gold lights.

VOA: special.2011.04.09

Unlike the other two, it isn't tapered at the edges, and my test unit sported an orange color, though it also comes in gray.

WSJ: Ultrabooks Bring Light and Speedy to Windows

Powder from the drill was a gray-green color, meaning it was not highly oxidized, said David Blake, principal investigator for Curiosity's Chemistry and Mineralogy investigation at NASA's Ames Research Center.

CNN: NASA: Yes, Mars could have hosted life

Wadsworth therefore painted out the feline paw and replaced it with a quieter hoof, gray in color and lightly bifurcated.

NEWYORKER: The Limner