按期地 duly ; punctually

定期地 periodically ; on a regular basis ; regularly ; At Fixed Periods

无限期地 till the cows come home ; sine die ; until the cows come home ; indefinitely

早期地球 early earth

开证日期、地点 Date and Place of Issue

到期地点 Place of Expiry ; expiry place

长期地 in the long run ; chronically

有效期和到期地点 Validity and Place of Expiry

不定期地 aperiodically ; from time to time ; at irregular intervals

如期地 in due course