could we just let them do their job as students中job为什么不加s,job是可数名词

问题描述:

could we just let them do their job as students中job为什么不加s,job是可数名词
前面用their修饰,job为什么不用复数

这里的job,不是工作的意思,如果翻译成工作可以复数,但这里应该是职责.do their job,履行他们的职责,职责不可数.