aplanetic

例句：

1. 1.The aplanetic planets are the outermost planets in our solar system.
   太阳系中最外面的行星是类地行星。
2. 2.Astronomers study the aplanetic planets to understand their formation and evolution.
   天文学家研究类地行星，以了解它们的形成和演化。
3. 3.The aplanetic planets are characterized by their similar composition and size.
   类地行星以其相似的组成和大小而著称。