plus assurance
加上保证
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Smithfield and other pork producers in the U.S. follow a set of guidelines developed by the National Pork Board, an industry group, called the "Pork Quality Assurance Plus" program that governs the feeding and care of pigs.
WSJ: What China Can Learn From America's Hot Dogs
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