消息队列只能保证后面的事务具有不同的事务序列号。

Message Queuing guarantees only that subsequent transactions will have different transaction sequence Numbers.

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事务标识符包含后跟 4 字节事务序列号的发送计算机的标识符（前 16 位）。

The transaction identifier contains the identifier of the sending computer (first 16 bits) followed by a 4-byte transaction sequence number.

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