常見例句The complex nebula is thought to be a supernova remnant over a million years old, sprawling across the southern constellations Vela and Puppis.這個形狀複襍的星雲(yún)區(qū)域分佈在南天的船帆座和船尾座之間，它被認(rèn)爲(wèi)是一個超新星殘骸已經(jīng)有一百萬年齡。 返回 Puppis