1. 名詞
   義務, 責任
   an obligation to ...(動詞...):
   做...的義務
   做...的責任
   an obligation to/towards/toward ...(人):
   對...的義務
   對...的責任
   /以上可為可數與不可數名詞/
   可數名詞:
   合約, 契約
   

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   同義字詞
   burden,charge,commitment,duty,imperative,incumbency,need,office,responsibility
   arrearage,arrears,debt,indebtedness,liability,usually,liabilities,score
   

例句

1. There is no obligation to buy at all.
2. This is referred to as " obligation ".
3. They are under no obligation to do this.
4. The problem is not how obligation can oblige.
5. There is not an explicit obligation about that.
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