double-ring galaxy双: two; twin; both; dual环: ring; hoop星系: galaxy; galact-极环星系: polar-ring galaxy双环: bicycle; bicyclic ring; dicyclo; dual homing; twin circle下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:双环星系，即可在微信中查询翻译
