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.這個形狀復雜的星云區(qū)域分布在南天的船帆座和船尾座之間,它被認為是一個超新星殘骸已經有一百萬年齡。 返回 Puppis