Delta Cephei

例句：

1. 1. The Delta Cephei is a star that can be seen from Earth.
   天狼星是一颗可以从地球上看到的恒星。
2. 2. The Delta Cephei is a bright star in the constellation Cephei.
   天狼星是位于猎户座的一颗明亮的恒星。
3. 3. The Delta Cephei is a star that is often used as a navigational aid.
   天狼星常被用作导航辅助。