She has to work at weekends from time to time.

她偶尔周末还得工作。

《牛津词典》

Stress is a fact of life from time to time for all of us.

压力对我们所有人来说都是时常面对的现实。

《柯林斯英汉双解大词典》

From time to time he passed on confidential information to him.

他不时地传送机密情报给他。

《柯林斯英汉双解大词典》

To some people,they are nothing more than a harmless treat or a guilty pleasure to enjoy from time to time.

VOA: special.2010.04.12

And from time to time, particularly in section discussion, you will have occasion to consider the ways in which sometimes in very contradictory ways--over the centuries.

在课堂讨论中，大家需要不断地去考虑,有时候甚至可能是持续几个世纪的完全相反的说法。

耶鲁公开课 - 旧约导论课程节选

I know, lonely, but that's what happens from time to time.

我知道，这样会有点孤单，但这是很正常的。

来西部的原因 - SpeakingMax英语口语达人

From time to time we are invited by UNESCO to host UNESCO international activities in New Zealand.

UNESCO: What we do

Great moments are when the seamless walls blocking entrepreneurs open up from time to time.

FORBES: Saving India's Silk Weavers

Lenders and investors follow each other and from time to time act irrationally as a herd.

CNN: ASIANOW - TIME Asia