Updates database in a transaction; evicts cache before the previous transaction completes; evicts cache again for safety after the previous transaction has completed successfully or not.

在一个事务中更新数据库；在上一个事务完成前就清除缓存；为了安全起见，无论事务成功与否，在事务完成后再次清除缓存。

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Our clients have stopped asking, ‘Is this the lowest rent? ’ and ‘Are the rents going down? ’ but they’re trying to rationalize the transaction by putting on other safety valves.

客户不再关心，‘这房租是最低的吗’或者‘房租还会再下降吗’，他们都希望找到字的的合理方式来确保交易的成功。

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The model can satisfy the requirement of secure transaction, such as safety, no-deny, credibility, confidence.

该模型满足安全交易的要求，包括安全、不可否认、可信和隐私保护。

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