So is the main concept behind a franchise that of a promise between setting up on your own andworking for a pany. 英语
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【答案】 that of … 的意思是“…的同类的那种东西/事情”
that of a promise between setting up on your own and working for a pany 表示“在自己独立建立和供职的公司之间折衷的那一类（特许经营权背后的主要理念）”