1. 名詞
   理由, 原因
   動機
   a reason for ...(事物)/
   a reason that ...(完整句):
   ...的理由
   ...的原因
   ...的動機
   a reason for ...(動詞ing...)/
   a reason to ...(動詞...):
   做...的理由
   

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   同義字詞
   account,accounting,argument,case,explanation,rationale
   account,authority,grounds,motive,subject,wherefore,why
   alibi,apology,defense,excuse,justification,plea
   antecedent,causality,causation,cause,occasion
   brain(s),brainpower,gray matter,headpiece,intellect,intellectuality,intelligence,mentality,sense
   daylights,head,marbles,mind,saneness,sanity,wit(s)
   intellection,logic,ratiocination,reasoning,sense
   

2. 動詞
   不及物動詞:
   推論, 推理
   思考
   辯論, 討論
   勸說, 規勸
   講道理, 說道理
   講理
   以理相勸
   及物動詞:
   說服...(人)
   

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   同義字詞
   conclude,decide,deduce,derive,extrapolate,gather,infer,judge,make out,understand
   argue,assert,contend,maintain,plead
   

3. 形容詞
   deaf to reason:
   不講道理的
   不聽理由的
   

4. 副詞
   for some reason:
   由於某個理由
   由於某種原田
   也不知是什麼原因
   with reason:
   有充分理由地
   有正當理由地
   within reason:
   在合理範圍內
   in reason:
   

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5. 動詞片語連結
   (主詞限定it)stand to reason:
   不言而喻
   顯而易見
   (主詞限定it)stand to reason that ...(完整句)/
   (主詞限定it)stand to reason ...(完整句):
   ...不言而喻
   ...顯而易見
   

6. 成語
   It stands to reason:
   不言而喻
   顯而易見
   It stands to reason that ...(完整句)/
   It stands to reason ...(完整句):
   ...不言而喻
   ...顯而易見
   

例句

1. SelectUSA is a big reason why.
2. Just another reason to love your reds!
3. This is one reason I like working in 3D.
4. Any reason was going to " do" for this guy.
5. This gives them a real-life reason to do so.
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