open date短语⁵¹⁴¹⁷ 基本例句 食用期限,食品保存期限 Although dating of some foods is required by more than 20 states, there are areas of the country where much of the food supply has some type of open date and other areas where almost no food is dated. 可能有些食品会在20多个州都被要求制定出有效期，但是这个国家仍然有些地方正在销售许多没有标出有效期的食品，还有些地方的食品甚至从来没有日期的概念。 yeeyan