hump cepheid

例句：

1. 1. The Orion Nebula is one of the most famous astronomical objects in the sky.
   猎户座星云是天空中最著名的天文现象之一。
2. 2. This double star system is so close together that they can be seen from Earth.
   这个双星系统如此靠近，以至于可以从地球上看到它们。
3. 3.Astronomers have been studying this region for decades to understand its complex structure.
   天文学家已经对这个区域进行了几十年的研究，以了解其复杂的结构。