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obligation的动词「obligation的同义词」
obligation的意思 obligation n.1. [C] law, moral pressure, promise, etc that forces one to do sth （法律、...
obligation的动词「obligation的用法」
obligation是可数的么? OBLIGATION可数名词，也是不可数名词。N-VAR 义务;责任If you have an obligation to do something, it is...