I'm sorry to trouble you, but I wondered if by any chance you know where he is.

对不起打扰您了，我想问问您是否碰巧知道他在哪里。

《柯林斯英汉双解大词典》

If by any chance you need my help, please never hesitate to ring me up.

万一你需要我的帮助，请尽管打电话给我。

youdao

If by any chance you want to cancel the trip, please notify us in writing at least one month in advance.

万一你想取消这次旅行，请至少提前一个月书面通知我们。

youdao

So, if any of you doesn't want to be, by chance, seen on the Internet, then sit out of range of the camera.

如果你们不想要，意外地，出现在网上的话，那么就坐在摄像机拍摄的范围外。

麻省理工公开课 - 固态化学导论课程节选

"We are preparing measures to track the missile's trajectory and shoot it down if it, by any chance, deviates from the planned route and falls into our territory, " a defence ministry spokesman said.

BBC: Obama in push for 'world without nuclear weapons'

When asked by Morgan Stanley analyst Betsy Graseck if there was any chance the bank would consider 2011 for buybacks or if 2012 was the earliest time in which shareholders could expect some sort of increase in dividends, Pandit reiterated his position.

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If there's any chance they would change their minds, the approach by Argentina is completely counterproductive.

BBC: William Hague: Argentina bullying Falklands