For example, the pattern o {2} would match two (and only two) o characters.

例如，模式o{2}将匹配两个(仅仅两个)o字符。

youdao

B And mu B in the liquid phase B has to be equal to mu B in the gas phase. S o four minus two constraints means you have two degrees of freedom.

液相的μ,必须等于气相的μ,所以四减去二意味着,你有两个自由度。

youdao

Some even turn on the light at two o 'clock, and most of them are awake by six o 'clock although it is not light in England for another hour or two at this time of the year.

有些人甚至在两点钟的时候开灯，但大多数人还是在六点钟醒的，虽然在英国这个时间就算再过一两个小时也还没有天亮。

youdao

Without new treatments,the W.H.O.says, the number of new cancer patients could reach twenty-seven million a year by two thousand thirty.

VOA: special.2009.03.02

You start with O double minus, so that is oxygen plus two electrons.

你从氧二负离子，也就是氯元素带2个负电子。

麻省理工公开课 - 固态化学导论课程节选

So we have like, I'm course 2. And my classes are, you know, two double o one (2001)

比如说，我的专业是课程2，我的课是001（2001），

社团小组信息 - SpeakingMax英语口语达人

Maguire had been in fine form en route to the final but only potted two balls in the first two frames as O'Sullivan moved into gear with breaks of 54 and 66 in the opener.

BBC: CHOOSE A SPORT

One benefit of the two-year delay in O's release is that two of its stars, Julia Stiles and Josh Hartnett, virtual unknowns when the picture was shot, now enjoy much bigger Hollywood profiles, which should help the film at the box office.

BBC: Controversial Othello film screens

Two O'Gara penalties nudged Munster 9-6 ahead but Sean O'Brien set up O'Driscoll's decisive 70th-minute try.

BBC: Leinster 13-9 Munster