名词
中文翻译：Unknown
同义词：
['white hair', 'silver hair']
例句：
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1. As he grew older, his grey hair became more noticeable.
随着他年龄的增长，他的灰发变得更加明显。
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2. The old man has a lot of grey hair and looks quite wise.
这位老人有很多灰发，看起来非常睿智。
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3. She often talks about her grey hairs as she ages.
她经常谈论随着年龄增长而增多的灰发。