System switch的用法和樣例：
例句
- The system vicissitude is the key factor in modern society.
制度變遷是社會(huì )現代化變革的關(guān)鍵性因素。 - The second part analyzes the cause of Electoral System Vicissitudes in respect of both exogenous change and endogenous change.
第二部分從外生變遷和內生變遷兩個(gè)方面分析選舉制度變遷的動(dòng)因。
