They launched the snakes from the top of a 15-metre tower and used four video cameras to construct 3-D images of the animals’ trajectories.

研究人员使树蛇从15米高的塔顶端飞行，过程中使用了4个摄影机拍摄蛇滑行的轨迹，以拍摄成三维立体图像。

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The researchers used four different experiments to separate out the influence of male and female factors on reproductive success -- something that is difficult to study in wild animals.

研究人员采用了四种不同试验找出公鸡与母鸡对繁殖成功率的影响---虽然野外动物的研究存在某些困难。

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Once the session was over, this person was asked to identify which of the four images had been used.

会议一结束，这个人就被要求辨认四张图片中哪一张被使用过。

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Since two thousand five, the F.C.C.has used four policy principles to guide its enforcement in cases related to the Internet.

VOA: special.2009.09.25

I have no idea what's here at the moment so I'm just going to draw a question mark because that memory might have been used previously for some other purpose, but we know it's currently available to us so we have four bytes of memory.

我不知道在此刻这里是什么,所以我画一个问号，因为那块内存可能在之前,为其它的目的而使用过，但是我们知道它可以为我们所使用,这样我们就有4个字节的内存。

哈佛公开课 - 计算机科学课程节选

2 3 Well, son of a gun, one, two, three, four, five, six, sulfur, We've got six. We've used all the electrons.

真见鬼，4，5，6，硫，共六个，我们已经用掉了所有的电子。

麻省理工公开课 - 固态化学导论课程节选

To measure each job CareerCast.com used four core criteria: pay, outlook, work environment, and stress.

FORBES: The Best And Worst Jobs For 2013

She used four cameras, including one underwater, to capture the movement of high divers from all angles.

ECONOMIST: Leni Riefenstahl: Hand-held history | The

The report used four mortality rate measures, including deaths after treatment and deaths in hospital care, to show which centres had a higher or lower rate than expected.

BBC: Nottinghamshire hospital trust promises changes