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grey matter

noun
🔊/ˈɡreɪ mætə(r)/
🔊/ˈɡreɪ mætər/
(US English usually gray matter)
[uncountable] (informal)
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  1. a person’s intelligence（人的）头脑，脑子
    • This should exercise the old grey matter.这应该锻炼旧的灰质。