Lean, hard-training women athletes may menstruate less frequently or not at all.

清瘦、训练艰苦的女运动员行经可能不那么频繁或根本没有月经。

《柯林斯英汉双解大词典》

It's here now, or not at all.

它现在就在这里，或者完全不存在。

youdao

It runs deep or not at all.

它要么深沉，要么根本没有。

youdao

The other would measure the rate at which all students repay their loans, whether they complete the program or not.

VOA: special.2010.07.29

This is a distinction which is not meant sort of counter-intuitively to suggest that somehow or another, as opposed to what we usually think, writing precedes speech--not at all.

这个区别没有在某种程度上故意地，与我们的直觉相反,暗示，无论如何，与我们通常想的相反,我们通常认为书写是在讲话之前的，完全不是这样。

耶鲁公开课 - 文学理论导论课程节选

It's not at all the same thing as Amsterdam, or London, or any of the other trading cities around.

这与阿姆斯特丹很不一样,或者说跟伦敦,以及跟任何贸易城市都不一样

耶鲁公开课 - 欧洲文明课程节选

It is not unheard of for data to be submitted incorrectly or not at all.

BBC: Why death rates aren't an exact science

At the end of the day, ethanol will move over land or not at all.

FORBES: Ethanol: Getting There Is None Of The Fun

Just under two-thirds said they aren't following the campaign very closely, or not at all.

WSJ: Democratic Voters Favor Best-Known Mayoral Candidates in Early Polls