She scanned the crowd on the off chance of seeing someone she knew.

她扫视着人群，抱着一线希望看是否有熟人。

《牛津词典》

He looked uncannily like someone I knew.

他酷似我认识的一个人。

《牛津词典》

He decided to find someone who knew the natural environment well to solve the problem.

他决定找一个熟悉自然环境的人来解决这个问题。

youdao

"Hey,Michaelson",someone yelled, after the next words I knew it was Naufmann,the tailor.

VOA: special.2011.03.05

When someone invented the airplane, before you knew it every country had an airplane because there was a best practice, there was a best technology and it was not unique to any one country.

有人发明了飞机,不知不觉,每个国家都有飞机了,因为这些最佳的设计,这些最好的技术,并不是一个国家所独有的

耶鲁公开课 - 金融市场课程节选

"I think the bloom is off the rose but I don't think they quite knew who else it could be, or how to make it be someone else or facilitate a free and fair election.

VOA: standard.2009.08.03

One time we went to New York to use a bank because someone knew a building there.

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Two in five knew someone who had self-harmed, two in five knew someone who had panic attacks and one in three knew someone with an eating disorder.

BBC: Girl guides' warning on self-harm

How many of us have been told how "scary" certain places are because someone knew someone who'd once heard of someone who'd been robbed on a train or gotten sick from the water?

CNN: 8 travel resolutions for 2013