If only sometimes, under what conditions?

如果只是有时工作，那么是在什么情况下？

youdao

Well... only sometimes, and only in certain situations.

好吧…只在某些时侯，而且只在某些特定情况下。

youdao

Failed states always cause misery, but only sometimes are they a global threat.

失败的国家总会带来不幸，然而这些国家只有在某些时候才会产生世界范围的威胁。

youdao

Sometimes the only way doctors can treat an injury like this is to remove frostbitten areas like fingers and toes.

VOA: special.2010.12.22

OK PROFESSOR: Valence electrons. OK, sometimes you're going to be asked to draw a molecular orbital diagram where you're asked to include all electrons, and sometimes it will specifically say only include valence electrons.

教授：价电子，有时候你画一幅分子轨道图,有时候要求你画出所有的电子，有时候特别要求,只包括价电子。

麻省理工公开课 - 化学原理课程节选

And homework, it varies between classes. Sometimes you only get one assignment,

家庭作业，也跟课程的不同而有所差异。
有时候你只有一个作业，

很好奇住宿生活 - SpeakingMax英语口语达人

The old ones were well toasted, but the new ones are only sometimes crisp.

NEWYORKER: Francesca

Failed states always cause misery, but only sometimes are they a global threat.

ECONOMIST: Failed states

This is typical m.0. for PETA, especially when it comes to designers who use fur only sometimes, and then only for trim.

FORBES: Dear PETA: Screaming Rabbits Are Not the Answer