“有效使用期”或“最好于该日期前使用”表示的是该产品在这个日期前，从口感、质地、外观、气味和营养价值等各方面保质着最佳质量，过期之后质量就会逐渐下降。

The “use-by” or “best if used-by” date indicates the last day that the item is at its best quality as far as taste, texture, appearance, odor, and nutritional value. The decline after that is gradual.

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另外，要注意保质期或者最晚饮用日期。

Also, pay attention to the expiration or "use by" date.

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在验货过程中对项目质量、规格、生产日期、保质期、产品序号等进行严格的把关并登记。

Product quality, spec, produce date, valid dates and serial number must be checked and recorded strictly.

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