extraterrestrial的复数形式怎么写

One theory about the existence of extraterrestrial life rests on the presence of carbon compounds in meteorites.地球外存在生命的理论是基于陨星上存在碳化合物质这一事实的.Methane may have extraterrestrial significance.甲烷具有星际意义.In going through the ea...

extraterrestrial的音标：extraterrestrial的英式发音音标为：[ˌekstrətə'restriəl]extraterrestrial的美式发音音标为：[ˌɛkstrətə'rɛstriəl]...

adj.地球外的，地球大气圈外的n.外星人...

NASA has started a 10-year search for extraterrestrial intelligence.美国航空航天局已经启动了一个为期10年的寻找外星人的项目。One theory about the existence of extraterrestrial life rests on the presence of carbon compounds in meteorites.地球外存在生命的理论是...