发射星云 fāshèxīngyún emission nebula Definitions Defs Origin Strokes Stroke Words Sentences Sents 发射 發射 fāshè to transmit to emit or transmit signals, radio waves, or particles星云 星雲 xīngyún nebula A cloud of gas and dust in outer space visible in the night sky as an indistinct bright patch or as a dark silhouette
