voice-grade service

例句：

1. 1. Our new phone has a voice-grade service that allows you to make calls from anywhere in the world.
   我们的新手机有一个语音等级服务，可以让你从世界上任何地方打电话。
2. 2. The company offers a voice-grade service that provides high-quality audio and video calls.
   该公司提供语音等级服务，提供高质量的音频和视频通话。
3. 3.The voice-grade service is designed to improve the user experience by providing clear and natural sound quality.
   语音等级服务旨在通过提供清晰自然的声音质量来改善用户体验。