This philosophy is essential to gain support from vendors with vested proprietary interest in existing network and service management technologies.

对于赢得在现有网络和服务管理技术方面有既得专利权益的供应商的支持，这一思想是必需的。

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Since the invention of telephone, voice communications has been an essential and important service that all modern communications systems must support.

自从电话发明以来，语音通信一直是现代各种通信系统承载的一项重要的、必不可少的业务。

youdao

Since the invention of telephone, voice communications has been an essential and important service that all modern communications systems must support.

自从电话发明以来，语音通信一直是现代各种通信系统承载的一项重要的、必不可少的业务。

youdao