名词
中文翻译：脑增强剂
同义词：
['enhancer', 'cognitive enhancer']
例句：
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1. The nootropic drug has been shown to improve memory and focus.
这种脑增强剂已被证明可以提高记忆力和专注力。
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2. Some people use nootropic drugs as a way to stay awake during long flights.
有些人使用脑增强剂作为长时间飞行时保持清醒的方法。
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3. The research on nootropic drugs is still in its early stages, but it has thepotential to revolutionize the way we think about learning and memory.
对脑增强剂的研究仍处于初级阶段，但它有潜力彻底改变我们对学习和记忆的看法。