Translation of "regularly" into Chinese

Almost half the men in Great Britain regularly give chocolate to their partner, especially for their birthday.

大部分大不列颠的男人定期送巧克力作礼物给他们的合伙人,尤其是在他们生日的时候。

Does the error occur regularly or sporadically? Is the error reproducible?

错误是经常出现还是偶尔出现?错误是否能够模仿?

It regularly studies migration processes and the social well-being of various ethnic minorities.

该中心定期地研究少数民族的移徙过程和社会福祉情况。