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The stars must have formed 10 to 15 billion years ago.是什么意思？

The stars must have formed 10 to 15 billion years ago.

这些恒星一定是形成于100到150亿年前。

相关词汇
the stars must have formed to billion years ago

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；
例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

stars

abbr. specialized training and reassignment students 经过专门训练后再分配的学生，stationary automotive road stimulator (Toyota) 汽车公路固定刺激物（丰田汽车）；n. 星( star的名词复数 )，明星，（尤指旅馆或餐馆的）星级，星象（根据人出生时天体的位置而描述的命运）；
例句
Ptolemy charted more than 1000 stars in 48 constella-tions...
托勒密绘制了48个星座1,000多颗恒星的星位图。

must

aux. 必须，必然要，（做出逻辑推断），（表示坚持）；n. 必须做的事，必不可少的事物，葡萄汁，霉臭，麝香；vt.& vi. （表示必要或很重要）必须，（提出建议）应该，得，（表示很可能或符合逻辑）一定；adj. 不可或缺的，狂暴的；
例句
Some parents believe a boy must learn to stand up and fight like a man.
有些父母认为男孩子必须学会像男子汉一样顶天立地，勇于抗争。

have

aux. 用以构成完成式及完成式的不定式，表示已经…；vt. 有，具有，拿，取得，从事，必须，不得不；n. 〈口〉有产者，有钱人，富国，〈英俚〉欺骗，诈骗；
例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

formed

adj. 成形的，成形加工的；v. 形成，构成，产生( form的过去式和过去分词 )，是，（使）成形，结成（友谊）；
例句
A frown formed between her arched brows.
她皱起两道弯眉。

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；
例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。

billion

n. 十亿，数以十亿计，大量，一万亿；adj. （法美）十亿的，（英德）万亿的，无数的；
例句
The bank advanced $1.2 billion to help the country with debt repayments.
银行预支12亿美元帮助该国偿还债务。

years

n. 年( year的名词复数 )，年纪，一年的期间，某年级的学生；
例句
His wife was sentenced to seven years imprisonment for aiding and abetting him...
他的妻子作为他的从犯被判入狱7年。

ago

adv. 以前，过去的，之前；
例句
He was killed a few days ago in a skiing accident...
几天前他在一场滑雪事故中丧生。
热门例句
He acknowledged publicly that he might have made a mistake.
他当众承认自己可能犯了个错误。
...the spiralling vortex airflow that slows the plane.
使飞机减速的螺旋形气流涡旋
You just go on ahead. I'll come by later...
你只管先往前走。我随后就来。
He who spares his rod hates his son, But he who loves him chastens him early.
24不忍用杖打儿子的,是恨恶他;疼爱儿子的, 趁早管教.
For further information, please contact 414 3925, extension 2253.
详情请致电414 3925,转分机2253。
He sat there while I made the case for his dismissal...
他坐在那儿，听我陈述解雇他的理由。
Baroness Thatcher's claims seem credible to many.
撒切尔女男爵的主张在很多人看来是可信的。
Nothing to be got without pains but poverty.
一份耕耘，一份收获。
This decree obliges unions to delay strikes.
该法令迫使工会推迟罢工。
The right to demand payment from the endorser of a commercial paper when the first party liable fails to pay.
追索权当有支付义务的第一方不能支付时，可以向商业票据的背书人要求支付的权力。
相关例句
She was last seen toddling off in the direction of the sea.
人们最后一次见她时,她正跌跌撞撞地往海边走.
He addressed the audience in an eloquent speech.
他对听众讲起话来滔滔不绝。
Abraham, he declared, and Jesus Christ were his forerunners.
他宣布, 亚伯拉罕和耶稣基督是他的先驱.
This sort of work would have been inconceivable before the advent of microprocessors.
在微处理机问世之前这种工作是难以想象的。
An appeal fund was launched at the instigation of the President.
总统授意发起了一项救援基金。
longueurs and passages of meretricious vulgarity
乏味的段落和极其庸俗的章节
She found two spent matches.
她发现了两根用过的火柴。
The factory has several shallow pools of brackish water.
工厂有几个浅的咸水池。
Bruce Springsteen has re-hired his muso collective, the E Street Band.
布鲁斯·斯普林斯汀重新组建了他的音乐团队，E街乐队。
To burn one's bridges is to commit oneself to an irreversible course.
破釜沉舟,就是选择一条不可回头的道路.