mwc 922造句

例句与造句

1. MWC 922 is a star surrounded by a planetary nebula.
2. The nebula contains concentric rings, which are similar to those seen in the supernova SN 1987A . MWC 922 itself is an FS Canis Majoris variable, meaning that it is a Be star containing exceptionally bright hydrogen emission lines as well as select forbidden lines, likely due to the presence of a close binary.
3. It's difficult to find mwc 922 in a sentence. 用mwc 922造句挺难的