Gònghézhì hé jūnzhǔzhì shì liǎng zhǒng bùtóng de zhèngtǐ.
Republicanism and monarchy are two different forms of government.
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history
The word 共和 (gonghe) itself comes from the Western Zhou period 共和 era (841-828 BCE), when nobles ruled jointly after King Li was exiled. Modern 共和制 was used by translators in the 19th century to render 'republic'.