an astronomer who studies the evolution and space-time relations of the universe
造句
用作名詞(n.)
Robert J. Scherrer is a cosmologist, chair of the Department of Physics and Astronomy at Vanderbilt and a published science-fiction author. 薛瑞是一位宇宙學家，曾出版過科幻小說，現擔任范德比爾特大學物理與天文系主任。