non-proliferation
noun [ U ] uk/ˌnɒn.prə.lɪf.ərˈeɪ.ʃən/ us/ˌnɑːn.prə.lɪf.əˈreɪ.ʃən/
(尤指对核武器或化学武器的)不扩散,防止扩散
the controlling of the spread and/or amount of something, especially nuclear or chemical weapons
a non-proliferation treaty 防止核扩散条约