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这些恒星一定是形成于 100 到 150 亿年前。用英语怎么说？

这些恒星一定是形成于 100 到 150 亿年前。

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

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。
This decree obliges unions to delay strikes.
该法令迫使工会推迟罢工。
Nothing to be got without pains but poverty.
一份耕耘，一份收获。
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。
Supporters of the death penalty argue that it would deter criminals from carrying guns...
死刑的支持者认为它能阻吓罪犯携带枪支。
相关例句
He figured out that you're lonely, like most widows, and he turned on the charm.
他看出你和大多数寡妇一样很寂寞，所以就拿出他的魅力来了。
I'll need a five-hundred-dollar retainer...
我将收取500美元的定金。
Protesters largely forbore from stone-throwing and vandalism.
抗议者绝大多数没有投掷石头和蓄意破坏。
...a glimpse into the future.
对前途的大致展望
He finally faltered in the last game of a heroic match...
他在这场艰苦比赛的最后一局中踉跄结束。
She would sit there drawing with the pencil stub...
她会坐在那儿用铅笔头画画。
She's dribbling on her collar.
她的口水流到了领子上。
The total cost of the project would be more than $240 million.
该项目的总成本会超过 2.4 亿美元。
Legends grew up around a great many figures, both real and fictitious.
围绕着许多人物都有传说流传开，有真实的也有虚构的。
The language is foul and the violence horribly realistic.
语言污秽，暴力场面非常写实。