写一段短文字数不少于二百(多则不限)。

Write a short passage of not less than 200 words.

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UDID是出现在序列号内的一长串文字数字式字符。

The UDID is a long string of alphanumeric characters which will appear in place of the serial number.

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一个编译过的文字数字或是在记忆体中数字的表示法是实作自订的。

The representation of a number as a compiled literal or in memory is implementation dependent.

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