Purchase products with complete package and specific date of manufacture and manufacturer.
选购是注意包装完整，有明确的生产日期和生产厂家。
If you can provide the 3-4 digit alpha-numeric code located on the bottom of the packaging, this will allow us to determine the date of manufacture.
如果你能提供3 - 4位数的字母，数字代号，位于底部的包装，这将使我们能够确定生产日期。
Date of production (Date of manufacture) : on the seal.
生产日期：见封口处。
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