强制性内容
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mandatory and optional content 必要内容和非强制性内容
·2,447,543篇论文数据，部分数据来源于NoteExpress
Consumer advocates have said that listing alcohol content should be mandatory so consumers know how much they are drinking.
NPR: Are Nutritional Labels Coming On Alcoholic Drinks
It also excludes all organic foods from mandatory GMO labeling irrespective of where they are consumed and of their GMO content.
FORBES: Who Will Cover the Costs of California's Prop. 37?
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