13% of in-flight medical emergencies—roughly four a day—are serious enough to require a pilot to change course.

飞机上医疗紧急情况中的13%——每天大约有四例——严重到需要飞行员改变航线。

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But 13% of in-flight medical emergencies–roughly four a day–are serious enough to require a pilot to change course.

但机上医疗紧急情况中的13%——每天大约有四例——严重到需要飞行员改变航线。

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When the town of Helena, in Montana, banned smoking for six months, for example, hospital admissions for heart attacks almost halved from seven to less than four a month.

例如，蒙大纳州的赫勒拿市禁烟6个月，每月心脏病患者住院数几乎减了一半，从7例降至不到4例。

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It began in April of nineteen ninety-four after a plane carrying the presidents of Rwanda and Burundi, both Hutus,was shot down.

VOA: special.2009.03.09

There's sort of a period around the age of four, four and a half, where kids make the transition from failure to success.

儿童在大约四岁四岁半时,会发生从失败向成功的转变

耶鲁公开课 - 心理学导论课程节选

It's been four and a half months now that I've been in and

我加入部队有四个半月了，

想当军人的理由 - SpeakingMax英语口语达人

It was four a.m. in Los Angeles and I'd woken him from a dead sleep.

NPR: 'Pretty' Chronicles Drastic Steps to Prevent Cancer

Triplets Wikum, Nikini and Madu Jayatunga, from Birmingham, picked up four A grades each.

BBC: NEWS | UK | Education | Grandmother, 78, passes A-level

It requires a lot of effort and ground work, unlike metals or energy, so we can only launch maybe four a year.

WSJ: Managing in Asia: Hariharan; Singapore Mercantile Exchange Finds the Pulse of Commodities Trading