胎牛血清，特优级，热灭活。
宾馆酒店、餐厅和特色市场更多地选用美国特优级牛肉。
Hotels, restaurants and specialty markets purchase most USDA prime meats.
美国优级和高级牛肉是仅次于特优级富含高脂肪的牛肉，大多肉类市场商铺提供这一类等级的牛肉。
USDA grades choice and select are the next highest in marbling, respectively. Most grocery stores offer these grades.
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