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1. Oxford Dictionary

   Non-Proliferation Treaty

   • ph.
     an international treaty aiming to prevent an increase in the number of countries possessing nuclear weapons, effective from 1970 and ratified by most members of the United Nations.
2. • 更多解釋

   Non-Proliferation Treaty

   • ph.
     an international treaty aiming to prevent an increase in the number of countries possessing ...

   Oxford American Dictionary