They fill these tubes with gases that glow when electrified.
他们在这些管子里注入了通电后会发光的气体。
The so-called active components, mainly composed of semiconductor and display, refer to those whose physical and chemical properties change when electrified.
所谓主动元件是指通电后物理或者化学特性发生变化的元件，主动元件主要是半导体元件和显示屏。
The second category is the passive components, which refer to the components that do not have physical and chemical changes when electrified, mainly including capacitor, inductor and resistor.
第二大类是被动元件，通电后不发生物理或者化学变化的元件，主要包括电容、电感和电阻。
The second category is the passive components, which refer to the components that do not have physical and chemical changes when electrified, mainly including capacitor, inductor and resistor.
第二大类是被动元件，通电后不发生物理或者化学变化的元件，主要包括电容、电感和电阻。
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