常見例句雙語例句This motion, called diurnal motion, produces the beautiful concentric arcs traced by stars during long time exposures.這種運動稱作“周日視運動”，在長時間曝光后就會拍到由星星軌跡構(gòu)成的美麗同心圓弧。jishenhua.jn.blog.163.comDuring that time, stars trailed through the night sky above Vancouver, their steady motion along concentric arcs a reflection of planet Earth's rotation.看，恒星在夜空彎成一道道弧，它們平穩(wěn)地運動著，仿佛告訴我們不要忘記地球在自轉(zhuǎn)。bbs.astron.ac.cn 返回 concentric arc