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1. Oxford American Dictionary

   what's this in aid of?

   • ph.
     what is the purpose of this?
2. • 相關詞

   what's (all) this in aid of?

   • ph.
     what is the purpose of this?

   Oxford Dictionary

3. • 更多解釋

   what's this in aid of?

   • ph.
     what is the purpose of this?

   Oxford Dictionary