Word证明zhèngmíngMeaningto provePart of speechverbPronunciationCourseHardcore ChineseLessonSetting up home internet serviceUsages of zhèngmíng这zhè 证明zhèngmíng 网络wǎngluò 不bù 稳定wěndìng。zhè zhèngmíng wǎngluò bù wěndìng.This proves that the network is not stable.