sequence number

基本解释

Assigns a sequence number for this event, if one has not been set by the event source.
如果事件源没有设置序号的话，那么为这个事件分配一个序号。
Typically, the nonce can be implemented as a counter (a sequence number) or as a timestamp.
现时标志通常能实现为计数器（一个序列数）或者时间戳。
Every SQL record has its own Unique Sequence Number, and you can also compute a custom unique number for all combined fields in the record.
每一条 SQL 记录都有它自己的惟一序号，您可以为记录中的所有组合字段计算一个定制的惟一编号。

Although many of the genes encoding El Tor's pathogenic machinery were already known, the new sequence does reveal a number of unexpected metabolic pathways that may prove useful for drug development, according to Dr Mekalanos.
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The result is variation in the number of copies of that sequence, a variability we call CNV.
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