In this condition, new communication technologies are introduced continuously. The old technologies are optimized, perfected and even replaced by the new ones.

在这种情况下新的通信技术不断地产生，并不断地优化、完善，甚至取代原有的通信技术。

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In this condition, new communication technologies are introduced continuously. The old technologies are optimized, perfected and even replaced by the new ones.

在这种情况下新的通信技术不断地产生，并不断地优化、完善，甚至取代原有的通信技术。

youdao