一旦决定扩充, 小兵就会变成军士, 军士就会变成军官.用英语怎么说？

一旦决定扩充, 小兵就会变成军士, 军士就会变成军官.

Once the decision to expand was taken , the privates could become sergeants, the sergeants officers.

once

adv. 一次，一趟，一倍，曾经，一旦；conj. 一旦…就…，一经；n. 一次，一回；

例句
The Hell's Angels were once the most notorious and anarchistic of motorbike gangs.
“地狱天使”曾是飞车党中最臭名昭著和无法无天的一伙。

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。

decision

n. 决定，果断，决议，（法院的）判决；vt. [口语][拳击]靠判定击败（对手）；

例句
The decision was made to abort the mission...
决定中止这项任务。

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。

expand

vt. 使…变大，扩张，详述；vi. 扩展，发展，张开，展开；

例句
The interest rate's coming down. I'll be able to expand or stay in business...
利率正在降低，我可以扩大公司或者维持经营。

was

v. 用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质（ be的过去式 ），在，存在，不受干扰；

例句
There was a terrible sadness in her eyes...
她眼神中流露出深深的悲伤。

taken

v. 拿( take的过去分词)，接受，取得；

例句
Roland was taken aback by our strength of feeling...
我们反应如此强烈，令罗兰大吃一惊。

privates

n. （从插塞外壳引出的）第三导线，列兵，士兵( private的名词复数 )，阴部，兵卒；

例句
You should wash your feet and your privates every day.
应该每天洗脚，并清洗阴部。

could

aux. “can”的过去式，能够，打算，用于假设语气的条件句，用于虚拟语气的结论句；

例句
The regulations were relaxed and the prisoners could get out and about a bit.
规定有所放宽，犯人可以出去短暂放风。

become

vi. 变为，成为，变得，变成；vt. 适合，适宜，相称，相当，变成，发生；

例句
...abandoned buildings that become a breeding ground for crime.
沦为了犯罪温床的弃置楼群

sergeants

n. 警官( sergeant的名词复数 )，（美国警察）警佐，（英国警察）巡佐，陆军（或空军）中士；

例句
Platoon sergeants fell their men in on the barrack square.
排长们在营房广场上整顿队伍.

officers

n. 军官( officer的名词复数 )，（政府，会社等的）高级官员[职员]，警察的头衔；

例句
The officers and crew prepared to abandon ship in an orderly fashion.
全体船员秩序井然地准备弃船。