这些硅晶开关比用于早期电路的真空管要小得多。
These silicon switches were much smaller than the vacuum tubes used in early circuitry.
基于真空管技术，三极管提供了使用当前电流打开或关闭一个电路能力。
Built on vacuum tube technology, the triode provided the ability to turn an electrical circuit on or off using current flow.
真空管放大器首次用于大西洋岸至太平洋岸的电信电路中。
Vacuum tube amplifiers used the first time in coast-to-coast telco circuits.
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