an astronomer who studies the evolution and space-time relations of the universe
例句
用作名词(n.)
Robert J. Scherrer is a cosmologist, chair of the Department of Physics and Astronomy at Vanderbilt and a published science-fiction author.薛瑞是一位宇宙学家，曾出版过科幻小说，现担任范德比尔特大学物理与天文系主任。
