In seven innings, he gave up only four hits and two earned runs against the Pittsburgh Pirates.

VOA: special.2010.06.18

Because it takes three units where there's only four choices at each position to have at least 20 unique combinations.

因为每个位点上仅有四种可能性,只有采用三个碱基一组,才能取得至少二十种不同的组合方式

耶鲁公开课 - 生物医学工程探索课程节选

While there are only four different bases that make up either RNA or DNA, and so the complexity of an RNA polymer is limited.

在RNA或DNA的构成中,只含四种不同的碱基,因此一个RNA分子的复杂程度是有限的

耶鲁公开课 - 生物医学工程探索课程节选

And only four states Texas,Oklahoma,New York and now Missouri require lab approval by an accrediting organization.

VOA: special.2009.10.03

One, two, three, four, so on each level of the picture I'm drawing, I've seem only to be looking at each number once.

，2，3，4，可见，在我画的,这幅图的每一层上，对每个数字,都只会用到一次。

哈佛公开课 - 计算机科学课程节选

Experts say a reduction of only four or five percent in body water leads to a drop of twenty to thirty percent in work ability.

VOA: special.2010.07.27

And not only was it a party school, you were going to have an amazing time for the four years and beyond.

不仅是个派对大学，而且未来四年甚至以后，都会过得很快乐。

哈佛公开课 - 幸福课课程节选

Apollo Twelve lifted off only four months after the Apollo Eleven flight.

VOA: special.2009.07.29

That makes sense because we know that every single electron has to have its own distinct set of four quantum numbers, the only way that we can do that is to have a maximum of two spins in any single orbital or two electrons per orbital.

那个讲得通,因为我们知道每一个电子,都有它自己独特的量子数,我们能做的唯一方式是,在任一单个轨道中最多有两个自旋电子,或者每个轨道有两个电子。

麻省理工公开课 - 化学原理课程节选

Until now,only four genes had been linked with the disease.

VOA: special.2009.09.15

Motive would only go about four, five, six notes.

动机只会有四,五,或六个音符

耶鲁公开课 - 聆听音乐课程节选

Rutherford Hayes kept his promise to serve only four years.

VOA: special.2010.03.11

But,the turbo-prof will be somebody who is assigned to Reims, and who takes the train there every day, or to Tours; but to Lyon also since this is only two hours, this is four-hundred kilometers.

不过涡轮教授被派到兰斯教书,他每天都要坐火车往返,抑或是去图尔斯,从这里去里昂要用两小时,这有四百公里

耶鲁公开课 - 1871年后的法国课程节选

But only four of them are clearly seen.

VOA: special.2010.05.31

In DNA there's only four colors, there's only four bases,.

在DNA中仅有四种颜色,只有四种碱基CTGA

耶鲁公开课 - 生物医学工程探索课程节选

And in sub-Saharan Africa, where only four percent of the land is irrigated, buying a small pump can make a big difference.

VOA: standard.2010.08.09

Now remember that there were only four different colors in the cartoon of the DNA double helix that we talked about and I told you that those colors are really - represent the bases but there's five of them here.

现在要记住只有四种不同的颜色,在双螺旋DNA的卡通模型上出现,我们刚说过这个,我告诉你们的这些颜色,它们代表不同的碱基,不过有五种碱基

耶鲁公开课 - 生物医学工程探索课程节选

Yet up at about five-thousand-four hundred meters the air pressure is only about half of what it is on the ground.

VOA: special.2011.04.06

It's only got one of four possible choices at each position.

每个位点上都只有四种可能性

耶鲁公开课 - 生物医学工程探索课程节选

And once he said: "Four-fifths of our troubles in this life would disappear if we would only sit down and keep still."

VOA: special.2010.12.23

It dropped dramatically in the period from 1954-- this is these filled black bars refer to this axis, polio cases per 100,000 population dropped down to only three or four cases by 1956.

患病率在一九五四年后的,一段时间里急剧下降,该坐标轴上的这些黑色柱形图表明,到一九五六年,小儿麻痹症的发病率,已经降低至每十万人中仅三到四人发病

耶鲁公开课 - 生物医学工程探索课程节选

Men compete in teams of two and four, while women only compete in teams of two.

VOA: special.2010.02.10

Only Native Americans,cowboys, and explorers entered this area before the park was established in nineteen sixty-four.

VOA: special.2009.04.15

On July thirty-first, the ship traveled six hundred and one kilometers in only twenty-four hours.

VOA: special.2009.12.23

And that is a problem since there are only twenty-four hours in a day.

VOA: special.2010.06.04

Today,the fifty-four year old entertainer says she is only doing music.

VOA: special.2010.02.22

These four men climbed into the only remaining lifeboat.

VOA: special.2010.03.06

She died that year. She was only forty-four.

VOA: special.2010.02.28

All became hits. This made Justin Bieber the only artist in the history of Billboard magazine to have four singles from his first album among the most popular songs before the albums release.

VOA: special.2010.02.26

When you only have one classroom, but you have four different classes, you can only separate them by benches.

VOA: standard.2010.02.25