在英语中，“a”和“an”被称为不定冠词，“the”被称为定冠词。
In English, "a" and "an" are called the indefinite article, and "the" is called the definite article.
乔治犹豫不定—他是该去呢，还是不该去？
她举棋不定，不知是在这个城市里买所房子，还是迁居他处。
She's wavering between buying a house in the city or moving away.
他们在一起度过了分分合合动荡不定的五六年。
They had been together for five or six turbulent years of break-ups and reconciliations.
很多年过去了，在伦敦火车站下车的这位年纪不定的优雅女士是谁呢？
Years have rolled by, and who is this elegant lady of uncertain age alighting at London Station?
煤气可与烟雾缭绕的油灯和摇曳不定的蜡烛相媲美，在新世纪之初，富裕的伦敦人逐渐习惯了有煤气照明的房子，甚至街道。
Coal gas rivaled smoky oil lamps and flickering candles, and early in the new century, well-to-do Londoners grew accustomed to gaslit houses and even streets.
他的表情在不露声色与茫然之间变幻不定。
他不定期地看望父母。
她让人捉摸不定的魅力和无厘头的作风是个传奇。
不知道我下一步棋该怎么走，我的手在棋盘上方举棋不定。
With no idea of what to do for my next move, my hand hovered over the board.
帕特里克漂泊不定的生活方式使他在伦敦和洛杉矶之间奔波。
Patrick's roving lifestyle takes him between London and Los Angeles.
离终场还有十分钟，我们以0:2落后，随后我们进球了。谁输谁赢还说不定呢！
We were losing 2–0 with ten minutes to go, and then we scored. It was game on!
他的新剧本《阿卡狄亚》是他迄今为止创作的最错综复杂、煞费苦心和让人琢磨不定的。
His new play, Arcadia, is as intricate, elaborate and allusive as anything he has yet written.
你知道，经济不景气使全球货币像坐过山车一样起伏不定。
You know that troubled economic times have put global currency on a roller coaster ride.
这就导致很多美国人骨子里就是不安于现状、漂泊不定而且野心勃勃的人。
As a result, many Americans were inveterately restless, rootless, and ambitious people.
她忖量了半天，还拿不定主意。
She turned the matter over in her mind for a long while, but still could not come to a decision.
乔治·华盛顿当时对这一战术举棋不定。
我的歌叹息着，欲言又止，打不定主意。
塔米莎想把卧室刷成紫色。汤姆则拿不定主意。
我的心情也依然在高兴与不自在之间摇摆不定。
My emotions continued to seesaw between pleasure and embarrassment.
这两本书中的福斯特让人觉得捉摸不定、老于世故。
But the Forster in both these books comes across as covertly sophisticated.
军事任务的一个不定因素是，你决不知道什么时候会被突然调离。
One of the uncertainties of military duty is that you never know when you might suddenly get posted away.
也许这一举措是为了拓宽年轻一代的阅读面也说不定；
Perhaps the intention was to vary the literary diet of the young;
仰望着空中轻轻飘过的云，莫非那就是我脱离尘世而游离不定的心？
Looking up at the cloud blowing past softly, I wonder if that is my heart escaping the mundane world which keeps drifting about in the air.
这就是当你拿不定主意到底穿什么鞋的时候必须牢记的法则。
This is all the rule you need to know when trying to figure out what shoes to wear.
此次合作还突显了起伏不定的铁矿石价格对中型钢企造成的压力。
The co-operation also highlights the pressures that volatile iron ore prices impose on mid-sized steel mills.
这里介绍的所有技术都是标准，尽管这个词本身就有点捉摸不定。
All the technologies I present here are standards, although that word is itself a bit slippery.
这里介绍的所有技术都是标准，尽管这个词本身就有点捉摸不定。
All the technologies I present here are standards, although that word is itself a bit slippery.
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