原句可以转化为：
There would be no such thing like vocation were it not for such a thing as school.——
There would be no such thing like vocation if it were not for such a thing as school.还原为if从句【与现在事实相反的虚拟语气】
翻译：如果不是因为有学校,也就不会有假期这回事.
或：如果没有学校,也就不会有假期.