如果可能，还有包含子系统的元件书签，如一个类的属性和操作。
Potentially, bookmarks for the elements containing children such as a class's attributes and operations.
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.
第一大类是主动元件。
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