Sometimes they make trouble, but sometimes they can help us.

有时他们会制造麻烦，但有时他们可以帮助我们。

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But sometimes they get mad.

但有时也发火。

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But sometimes they don't.

有时则不然。

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But sometimes they have other uses.

VOA: special.2009.09.29

Easiest to find them in embryos but sometimes they can be found in adult organisms as well.

它们在胚胎中最容易被找到,但有时在成人的机体中也能找到

耶鲁公开课 - 生物医学工程探索课程节选

Sometimes they challenge and contradict one another, but they are not best seen as linear, as telling a neat, linear story about Israelite religion flowering and fading.

有时候它们相互对质或矛盾，但它们从未被当作线性结构，整洁有序的故事,关于以色列宗教的兴盛与衰落。

耶鲁公开课 - 旧约导论课程节选

But sometimes they can get hints that the quality of a company's earnings is a little shaky.

FORBES: How Pretty Are Those Earnings?

But sometimes they give us an unexpected portrait of a composer in the midst of doubt and uncertainty.

NPR: Juilliard Chairman Donates Trove of Rare Artifacts

Gingrich certainly has energy and vision, but sometimes they outpace his wisdom.

CNN: The Lion of Growth