adj.周期性，周期的，定期的，间发性的

Eric suffers periodic mental breakdowns.
埃里克周期性地精神失常。
There is a periodic reshuffle of their company staff.
他们公司定期有人事变动。
The periodic table is an arrangement of all known elements in order of their atomic numbers.
定期表是按照原子序数排列的所有已知元素的排列。
Our company conducts periodic reviews of employee performance to ensure productivity and growth.
我们公司定期审查员工表现以确保生产力和成长。
The planet Mars has a periodic orbit around the sun, completing one revolution every 687 days.
火星围绕太阳有一个周期性的轨道，每687天完成一次公转。
The doctor recommended periodic health check-ups to monitor any changes in my condition.
医生建议我定期做健康检查，以便监测我的状况是否有任何变化。
The library undergoes periodic renovations to maintain its historical architecture and modern facilities.
图书馆定期进行翻修，以维护其历史建筑和现代化设施。
Many species exhibit periodic migration patterns, such as birds flying south for the winter.
许多物种展现出周期性的迁徙模式，比如鸟类冬季南飞。
The company offers periodic training sessions to update employees' skills and knowledge.
公司提供定期的培训课程以更新员工的技能和知识。
The tides are a periodic rise and fall of sea levels caused by the gravitational pull of the moon and the sun.
潮汐是由月球和太阳的引力作用引起的海平面周期性升降。
Farmers practice crop rotation as a periodic changing of crops to maintain soil fertility.
农民实行作物轮作，作为一种周期性更换作物的方法来保持土壤肥力。
The university holds periodic seminars where experts discuss the latest research findings.
这所大学举办定期研讨会，专家们在会上讨论最新的研究成果。