Bank online offered more modes of transaction except for the mode at counter, so the bank may attract more customers and got more competitive.

网上银行改变了过去单一的临柜交易方式，开拓了更广的客户群，提升了银行的竞争力。

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For example, the log buffer writes each transaction to logs and how different log mode can be used to accomplished different modes of backup and recovery.

例如，日志缓冲区将每个事务写到日志，可以使用不同的日志模式来实现不同的备份和恢复模式。

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Discussion: First, in the above two transaction modes, what time or what act signifies the formation of a contract?

上述两种交易模式中，合同在哪个时间段（或行为）成立？

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