The six fu organs are hollow

例句：

1. 1.The six fu organs are hollow, which means they have no internal organs.
   这六个器官是空心的，意味着它们没有内部器官。
2. 2. Fu organs are responsible for various functions in the body, such as digestion and blood circulation.
   器官负责身体的各种功能，如消化和血液循环。
3. 3. Researchers are trying to understand how these fu organs work together to maintain homeostasis.
   研究人员正在尝试理解这些器官如何协同工作以维持稳态。