摘要
Scientists have identified a second,mini-moon orbiting（环绕……运行）our planet that has probably only been around for about 100 years,reports NASA.This second moon looks to be a recently captured asteroid（小行星）and its subtle dance with Earth may be fleeting（短暂的）.
出处
《大学英语》
2017年第9期F0004-F0004,共1页
College English
