我不小心掉了眼镜，把它摔破了。

I dropped my glasses and broke them.

《柯林斯英汉双解大词典》

我不小心把我的脚趾踢到一条桌腿上。

I stubbed my toes against a table leg.

《柯林斯英汉双解大词典》

我不小心把你的照相机弄坏了。

I broke your camera by accident.

youdao

So, if you by chance, I know it's very rare, but if by chance you don't get the class you can always follow up later.

如果你们偶然，我知道不太可能，但是如果不小心你们错过了某节课,你们就可以在之后补回来了。

麻省理工公开课 - 固态化学导论课程节选

I wonder if my brother took them by accident.

我不知道是不是我的弟弟不小心错拿了我的钥匙。

I'm ~ing 实战 - SpeakingMax英语口语达人

And so this is why in problem set 5 last year when I took photographs on campus with a compact flash card, just standard consumer media and I accidentally formatted that compact flash card, I only lost the first few kilobytes, the first few thousand bits on that compact flash card.

这也是去年的套题5中,我们在校园里面用配有，简易闪存卡的标准摄像机拍照片,我不小心格式化了这个简易闪存卡,其实我只是丢失的最开头的几千个字节的数据。

哈佛公开课 - 计算机科学课程节选