The Audion became the key component of all radio, telephone, radar, television, and computer systems before the invention of the transistor.

在晶体管(transistor)发明以前，三极检波管是所有收音机、电话、电视机和计算机系统的基本组件。

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The visible telephone and visible doorbell have wide application and bright prospects. The electron gun is one of the key components of the picture tube for visible systems.

可视电话、可视门铃具有广阔的发展前景，其显像管电子枪属于关键部件。

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