贝尔实验室和西方电气公司联合推出同声新闻摄像机。
Bell Laboratories and Western Electric introduced the Sound Newsreel Camera.
为避免化学危害和电气危害，请遵守实验室安全操作规范。
To avoid chemical or electrical hazards, always observe safe laboratory practice when operating the system.
为避免化学危害和电气危害，请遵守实验室安全操作规范。
To avoid chemical or electrical hazards, always observe safe laboratory practice when operating the system.
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