He would have played but for a knee injury.

他要不是膝部有伤的话，就上场了。

《牛津词典》

I'm not afraid for me, but for the baby.

我担心的不是自己，而是婴儿。

《牛津词典》

The square was empty but for a couple of cabs.

除了几辆出租汽车外，广场上空空如也。

《牛津词典》

But for people who have a difficult time controlling their movements, this little navigational issue can be a really big problem.

VOA: special.2011.04.18

But for Milton's contemporaries in the seventeenth century, Milton's power really wasn't at all aesthetic or even religious in nature.

但在17世纪弥尔顿同时代的人看来，弥尔顿的力量却是毫无美感的，甚至本质上不是宗教上的。

耶鲁公开课 - 弥尔顿课程节选

But for me, I like to look at something and just say, "I like this. I don't really know why though."

但对我来说，我喜欢看着某个东西，然后说，“我喜欢这个。但我也不知道为什么。”

关于现代美术 - SpeakingMax英语口语达人

But for that to happen, it means that Democrats and Republicans have to work together.

WHITEHOUSE: Weekly Address: A Bipartisan Approach to Strengthening the Economy | The White House

But for many years French nationals in Africa have been exposed at tumultuous times.

BBC: Is France under attack in Africa?

But for Gale the building would prove to be the first of many hiccups.

FORBES: Scratch Builders