弹药的库存正在减少。用英语怎么说？

弹药的库存正在减少。

Stocks of ammunition were running low.

stocks

n. （树木等的）干( stock的名词复数 )，公债，家系，家族；

例句
World stocks of wheat were getting very low.
全球小麦储备严重不足。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

ammunition

n. 弹药，军火，<废>军需品，<比喻>战斗手段，子弹；

例句
He had only seven rounds of ammunition for the revolver.
他这把左轮手枪只有7梭子子弹。

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

running

n. 跑步，运转，流出；adj. 跑着的，流动的，连续的，操作中的，运转着的；v. 跑，运转(run的ing形式)；

例句
The rate of inflation is running at about 2.7 percent.
通货膨胀率大约为2.7%。

low

adj. 低的，矮小的，楼下的，低洼的，沮丧的，下贱的；adv. 低声地，谦卑地，底下地；n. 低点，低水平，牛的叫声；vi. （牛）哞哞叫；

例句
In absolute terms British wages remain low by European standards.
根据欧洲标准，英国工资的绝对值依然很低。