Because their two sets of wings effectively flap as one, that in theory gives them little control over the aerodynamic forces on their body.

因为它们的两副翅膀叠在一起，在空气动力学的理论中，这意味着它们对自己身体缺乏控制力。

youdao

In one experiment, rhesus monkeys and university students had to choose the bigger of two sets of geometrical objects that appeared briefly on a computer monitor.

在一个试验里，电脑屏幕上快速地闪过两组几何体，恒河猴和大学生被要求在两组几何形状中挑选出比较大的那些。

youdao

So there are two things in which you distinguish arguments but the first one is sets of sentences.

有两种东西你们要与论点区分开,但是第一种是几组句子。

youdao

so you can see that there is going to be two sets in antibonding, three sets in bonding for a net of one, giving us the single bond.

因此你能看到,反键轨道上有两组，三组成键，得到一组净成键，所以成的是单键。

麻省理工公开课 - 固态化学导论课程节选

One can see the amalgam of these two sets of ideas in his work.

读者可以在他们作品中看到两种思想的结合。

耶鲁公开课 - 文学理论导论课程节选

Argentina, who were runners-up to Spain last year, looked on course for a 2-0 lead heading into Saturday's doubles when Juan Monaco took a two sets to one lead in the other singles match against Tomas Berdych.

CNN: Spain surge into lead against U.S. in Davis Cup semis

In no time, though, Simon had won the next two sets and put one of Federer's longest-standing records in jeopardy: Before the match, he had reached at least the quarterfinals at 35 consecutive major events.

WSJ: Heard on the Field

The two sets of supporters were separated in one section of the ground by a barrier with riot police gathered on the Manchester United side.

BBC: NEWS | Europe | Fans in hospital after violence