定期 + Verb / 定期 + 的 + Noun
定期 (dìngqī) is an adverb meaning "regularly," "periodically," or "at fixed intervals." It describes actions that occur on a consistent, scheduled basis. It can also function as an adjective, as in 定期检查 (regular checkup) or 定期会议 (regular meeting).
你应该定期去医院做体检。
Nǐ yīnggāi dìngqī qù yīyuàn zuò tǐjiǎn.
You should go to the hospital for regular check-ups.
我们公司定期组织员工培训。
Wǒmen gōngsī dìngqī zǔzhī yuángōng péixùn.
Our company regularly organizes employee training.
他定期给远方的父母打电话。
Tā dìngqī gěi yuǎnfāng de fùmǔ dǎ diànhuà.
He regularly calls his parents who live far away.