大气层核试验 dàqìcénghéshìyàn atmospheric nuclear test Origin Definitions Defs Strokes Stroke Words Sentences Sents 大气层 大氣層 dàqìcéng noun atmosphere the layer of air or gases surrounding the earth or another planet; atmospheric layer核试验 核試驗 héshìyàn nuclear test; to conduct a nuclear test a nuclear weapons test; to carry out an experimental detonation of a nuclear weapon