1
periodically + VERB
副词置于动词前，强调动作的规律性。
The system periodically checks for updates.
该系统定期检查更新。
定期地；周期性地
先理解核心含义，再看它在真实句子里的用法。
定期地；周期性地
at regular intervals
The system periodically checks for updates.
该系统定期检查更新。
以规律或周期性的方式
In a manner that is regular or periodic.
间歇性或反复地
intermittently or recurrently.
I check my email periodically throughout the day to see if there are any urgent messages.
我一天中定期查看电子邮件，看看是否有紧急消息。
The garden needs to be watered periodically, especially during dry spells.
花园需要定期浇水，尤其是在干旱时期。
The machine requires periodic maintenance to keep it running smoothly.
机器需要定期维护以保持平稳运行。
副词置于动词前，强调动作的规律性。
The system periodically checks for updates.
该系统定期检查更新。
副词置于动词后，常见于被动语态或系表结构。
The magazine is published periodically.
该杂志定期出版。
副词位于句首，对整个句子进行频率说明。
Periodically, the equipment needs maintenance.
定期地，设备需要维护。
Not this
I go to the gym periodic.
Use this
I go to the gym periodically.
periodic是形容词，不能修饰动词，应改为副词periodically。
Not this
He studies periodically English.
Use this
He studies English periodically.
periodically应放在宾语之后，表示动作发生的频率，不能放在动词和宾语之间。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
周期性发生
The phenomenon occurs periodically every few years.
这种现象每隔几年周期性发生。
定期更新
You should update the software periodically to ensure security.
你应该定期更新软件以确保安全。
定期审查
The committee reviews the policy periodically.
委员会定期审查该政策。
定期检查
Check the tire pressure periodically to maintain safety.
定期检查轮胎气压以保持安全。
周期性地出现
The magazine appears periodically on a monthly basis.
这本杂志每月定期出版。
Use periodically naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
想象时钟指针周期性地转圈，每个period（周期）都重复出现。
语域：formal 常见场景：科学报告、设备维护 通常用于正式书面语，表示按一定时间间隔重复发生，比较常见于科学、技术或管理类文本。
强调动作或事件以间隔的方式发生
Dictionary facts from ECDICT, WIKTIONARY.