Working principle diagram of complementary symmetrical field effect transistor

Field effect transistors are divided into N-channel and P-channel. The two are used to form a complementary and symmetrical circuit, which is referred to as a CMOS complementary output circuit. As
shown in the figure is its schematic diagram . When the input terminal @ is a high level (digital "lt) input, the N-channel field effect transistor is turned on, and pin ③ outputs
a low level (digital "o") {when pin ② inputs a low level (digital "o" ), the P-channel field effect transistor turns on and outputs a high level (digital "1").