The came to school by twos and threes.

他们三两成群地来到了学校。

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We went to the station by twos and threes.

我们三三两两地走向车站。

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They went out hand in hand by twos and threes.

他们三三两两地手拉手出去了。

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But once in awhile, one of these plus twos comes in almost on axis, and it gets whipped around by the Coulombic repulsive forces.

但是偶尔一个带两个正电荷的粒子,以接近于轴的位置进入，会快速的移动到周围,由于库仑斥力的作用。

麻省理工公开课 - 固态化学导论课程节选

Earlier, Hussey stole the show with his highest Twenty20 score in England, including two straight sixes, but constructed largely by scampering twos and singles with shots to the long Rea Bank boundary.

BBC: Bears beat Notts at Edgbaston despite Hussey heroics

The return of Kevin Pietersen galvanised England and he batted beautifully and although he was clearly hampered by his Achilles injury and in no mood to run sharp ones or twos, he found the boundary five times, and cleared it three times as England improved on their 14 fours against the Dutch with 18 fours and six sixes here.

BBC: Jonathan Agnew column

Not ones and twos but hundreds of organizations are looking to compete with the large scale multi-nationals by using technology as a differentiator.

FORBES: Asia Looking to Leapfrog in Big Data