interstellar mediumWiktionary 原文释义（英文）名词 Noun(astronomy) The matter that exists in the space between star systems in a galaxy, including gas, dust, and cosmic rays.词族派生词（1）ISM相关词（11）intracluster mediumintergalactic mediuminterplanetary mediumextragalactic mediumextra-cluster mediuminterstellar spaceICMIGMIPMEGMECM