例句與造句

1. Some examples are Messier 49 ( radio source ), Messier 89 ( elliptical ) and Messier 90 ( spiral ).
2. NGC 4921 in the Coma Cluster and Messier 90 in the Virgo Cluster are examples of this type of galaxy; however, most spiral galaxies of the latter are more or less deficient in gas.
3. It's difficult to find messier 90 in a sentence. 用messier 90造句挺難的