For a fraction of second, I saw sun-dappled leaves in the trees far above me and heard voices clearly.

电光石火间，我清晰地看见头顶高处斑驳的树叶，也清楚地听到说话声。

youdao

In order to make a nuclear explosion, the critical mass must come together within a fraction of a millionth of a second.

为促成一次核爆炸，临界质量必须在一百万分之一秒内聚集在一起。

《柯林斯英汉双解大词典》

She hesitated for the merest fraction of a second.

她略微犹豫了一下。

《牛津词典》

I think its a major blow to the nations medical fraternity. It takes six years to produce a doctor, and within a fraction of a second, all that has disappeared. A week ago,Dr.Laroche was in Somalia and met with the minister of health.

VOA: standard.2009.12.05

When a brief pulse of electricity is sent to the read/write head it flips on a tiny electromagnet for a fraction of a second.

当一个简单的电脉冲被送到读写头,它会短时间内出现一个小的电磁。

哈佛公开课 - 计算机科学课程节选

Those of you who know other languages might have in your heads 200,000 words or 300,000 words and you're accessing them in a fraction of a second.

你们当中掌握其他语言的人,可能会在头脑中记住两万到三万个词,你们能在瞬间运用它们

耶鲁公开课 - 心理学导论课程节选

Google's search algorithm, capable of pulling information from hundreds of millions of Web sites in a fraction of a second, represents one of the most sophisticated tools that humans have ever developed.

FORBES: Magazine Article

Even more impressively, I could sit in my passenger seat holding a computer with 500, 000 times more processing power than computers that used to fill room and wirelessly access over 250 million computer networks around the world, whose content is indexed and can be searched at sites like Google in less than a fraction of a second.

FORBES: The New Pharaohs: Confusing Triumphalism and State Coercion With Progress

With such demands for power, some of it only for a fraction of a second, warship designers are keen to have a single system doing all manner of things.

ECONOMIST: Electric ships