区别就是两者意思是一样，但具体表达不同
Obligation中文意思是n.
职责;责任;(已承诺的或法律等规定的)义务;
例句
The new law released employers from their obligation to recognize unions.
新的法律免除了雇主承认工会的义务。
responsibility中文意思是n.
责任;负责;事故责任;职责;义务;任务;
例句
I think we have a moral responsibility to help these countries.
我认为我们在道义上有责任帮助这些国家。
