The next stage was the triode, which uses a third electrode called the grid.

下一阶段是三极管，它使用称为栅极的第三个电极。

The ability to amplify signals also made the triode crucial for radio and long distance communication.

放大信号的能力也使三极管对于无线电和长距离通信至关重要。

With 18,000 triodes, ENIAC was nearly the size of a tennis court and weighed 30 tons.

ENIAC 拥有 18, 000 个三极管， 几乎有一个网球场那么大，重达 30 吨。

These triode vacuum tubes would become the basis of radio, long distance telephone, and many other electronic devices for nearly a half century.

这些三极管真空管将成为无线电、长途电话，以及近半个世纪的其他电子设备的基础。