acyclic machine

例句：

1. 1. The graph is acyclic, meaning it does not have any cycles.
   这个图是无环的，意味着它没有循环。
2. 2. The process is cyclic, meaning it repeats a sequence of steps.
   这个过程是循环的，意味着它重复了一组步骤。
3. 3.The design is cyclic-free, ensuring that no parts can be used repeatedly.
   设计是无循环的，确保任何部件都不能被反复使用。