English-French translations for the reason why

• pourquoi
  Nous savons bien entendu pourquoi. Of course, we know the reason why.
  Voilà pourquoi j'ai voté comme je l'ai fait. That is the reason why I voted as I did.
  Voilà pourquoi j'ai voté pour. This is the reason why I voted in favour of it.

Related words

• across-the-board increase
• thermal grease
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• Department of the Treasury
• Secretary of the Treasury
• squeaky wheel gets the grease
• on the decrease
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• grease the palm