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character: Mr. Wang
topic: How Preservatives Affect Food Quality
grade: 9
subject: Chemistry
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character: Ms. Lee
topic: Chemical Reactions in Food Preservation
grade: 9
subject: Chemistry
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character: Dr. Chen
topic: The Role of Additives in Food Safety
grade: 9
subject: Chemistry
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character: Mr. Smith
topic: Understanding Food Labels and Preservatives
grade: 9
subject: Chemistry
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