It was the worst attack so far on the peaceful demonstrators in Taiz, a poor city four hours south of the capital, Sana'a, where there have been many protests since unrest broke out earlier this year.

这座不幸的城市位于也门首都萨那（Sana'a）以南，距其有四小时的车程。 至于首都萨那，自今年早些时候暴发动乱以来，一直有大批民众在抗议。

youdao

In the study, 402 9th- and 10th-grade students from four New York City high schools in low-income areas were divided into three groups.

在研究中，402名来自纽约四所低收入地区高中的9年级和10年级的学生被分为三组。

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It was discovered that rates of carbon cycling and growth rates among city trees were nearly four times faster than those in the countryside.

研究发现，城市树木的碳循环速度和生长速度几乎是乡村树木的四倍。

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A city report says economic activity last year totaled almost three billion dollars, a four percent decrease from two thousand seven.

VOA: special.2009.03.30

They build these three large canals and this expands the area of the city by four times.

他们凿建了三条巨大的运河,使得城市面积扩大了四倍

耶鲁公开课 - 欧洲文明课程节选

Now,Shirley Griffith and Steve Ember tell us all about Cape May as the city celebrates its four hundredth anniversary this year.

VOA: special.2009.06.01

Mayor Michael Bloomberg, a billionaire with no prior government experience, took over New York City four months after September 11.

CNN: 10 Questions For Michael Bloomberg

Weiss joined City four years ago and has played four games this season - three in the Carling Cup, including a goalscoring appearance against Arsenal, and one in the FA Cup.

BBC: Bolton complete deals for Weiss and Holden

The win puts Manchester City four points clear of fifth-placed Tottenham, who have a game in hand, but there are bigger tests to come for Mancini's side before the end of the season, starting with next weekend's derby with neighbours Manchester United.

BBC: Man City 5-1 Birmingham