ring nebula中文什么意思

m57

环状星云

• ring:    vt. (rang rung ) 1 ...
• nebula:    n. (pl. -lae nebul ...
• ring nebula = annular nebula:    环状星云

例句与用法

1. Here is the ring nebula , m57 , easily visible through a small telescope
   下图是m57戒指星云一个能用小型望远镜轻易看到的深空天体。