1 sentence for 定期 (dìng​qī — to set a date)

1. 与朋友和家人保持定期联系，或考虑加入班级或小组。

   yǔ péng​you hé jiā​rén bǎo​chí dìng​qī lián​xì, huò kǎo​lǜ jiā​rù bān​jí huò xiǎo​zǔ.

   Keep in regular contact with friends and family, or consider joining a class or group.

   Source: CCMatrix