她是一位看似虚弱但头脑极其敏锐的老年妇女。

She is an elderly woman who seems weak but has an extremely sharp mind.

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She is an elderly woman who seems weak but has an extremely sharp mind.

sharp 的本义是"锋利的",引申为"敏锐的、精明的",用来形容思维敏捷、反应快速。

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