fixed periodic block

例句：

1. 1.The machine has a fixed periodic block that needs to be replaced every five years.
   这台机器有一个需要每五年更换一次的固定周期块。
2. 2. The engineer designed the device with a fixed periodic block to ensure optimal performance.
   工程师设计了设备，带有一个固定的周期性块，以确保最佳性能。
3. 3.In the study, the researchers found that the use of a fixed periodic block could significantly improve the efficiency of the process.
   在研究中，研究人员发现使用固定的周期性块可以显著提高过程的效率。