动词
中文翻译：变灰
同义词：
['grey', 'darken', 'age']
例句：
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1.The old building has been grayed over by years of neglect.
这座老建筑因年久失修而变得灰暗。
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2.As the sun sets, the sky turns from blue to a deep shade of gray.
随着太阳落山，天空从蓝色变成了深灰色。
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3. The old books have started to show their grayed pages.
这些旧书的页面已经开始泛黄了。