An arbitrary key is usually just a sequential number, where the next available number is assigned when a new key is required.
任意键通常只是一个序列号，当需要一个新键时，就分配下一个可用的号码。
A sequential number used to ensure data uniqueness.
用于确保数据唯一性的连续编号。
QA department will allocate a sequential number to the nonconformance report.
质量保证部门(QA)负责为每个不合格报告配置一个序列号。
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