neptunium

例句：

1. 1.The planet Neptune is the largest in the solar system.
   海王星是太阳系中最大的行星。
2. 2. Neptune has a unique atmosphere that makes it difficult to land on.
   海王星有一个独特的大气层，这使得它很难着陆。
3. 3.The discovery of Neptune has expanded our understanding of the universe.
   海王星的发现扩大了我们对宇宙的理解。