Aunt Polly had drooped into a settled melancholy, and her gray hair had grown almost white.

波莉姨妈一直愁云笼罩，她灰白的头发几乎全白了。

If you see a gray hair, be thankful.

如果你看到一根白发，要心存感激。

People can get gray hair at any age.

人可以在某些年龄上得到灰色的头发。

There is not a gray hair on his head.

他头上没有一根白头发。

Many years later, Susan has gray hair.

很多年之后，素心有着花白的头发。