non-proliferation
/ˈnɒnprəʊˌlɪfəˈreɪʃən/noun
mass noun
- the prevention of an increase or spread of something, especially the number of countries possessing nuclear weapons防止扩散（尤指防止拥有核武器国家的数量的增加）：
as modifier a nuclear non-proliferation treaty.防止核扩散条约。