它优化了SET协议的模型结构，完善了交易流程，增强了交易的安全性。
The model structure of SET protocol is optimized, the transaction process is improved, and the transaction security is strengthened.
它优化了SET协议的模型结构，完善了交易流程，增强了交易的安全性。
The model structure of SET protocol is optimized, the transaction process is improved, and the transaction security is strengthened.
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