Once you have the vowels, you know which way to shift the rest of the letters.

知道了这些带元音的词后，你就知道如何移动其余的字母。

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Please note that the shift number could be negative, which means shifting letters backwards.

请注意，偏移数可以是负数，这意味着反向偏移字符。

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Some manufacturers also attached other letters to the end of the date code to indicate day of the week, work shift, serial number, lot number, etc.

有些厂家在日期后面还加上其他数字，代表生产日期的一周的那一天，那一班，序列号，批号，等。

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