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1.This product contains caffeine, which is a stimulant.
该产品含有咖啡因，这是一种兴奋剂。
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2. Caffeine can cause headaches and insomnia, so it's important to limit intake.
咖啡因可能导致头痛和失眠，因此限制摄入很重要。
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3. The caffeine in coffee is what gives it its energy boost.
咖啡中的咖啡因是赋予它能量提升的原因。