(noun.) a colorless odorless inert gaseous element occurring in the earth's atmosphere in trace amounts.
柏妮丝手打
双语例句
Discovery of Neon and Metargon by Ramsey and Travers; Coronium by Nasini; Xenon by Ramsey; Monium by Crookes, and Etherion by Brush. Edward W. Byrn.十九世纪发明进展.