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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；

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）；

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；

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；

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）；

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

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；

years

n. 年( year的名词复数 )，年纪，一年的期间，某年级的学生；

ago

adv. 以前，过去的，之前；
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