run low含义为: 不足，短缺，缺乏；即将用尽，快用完了
请看经典例句：
Food supplies began to run low.
所携带的食物快用完了。
What happens when food and petrol supplies run low?
食物和汽油这些补给品不足时会发生什么情况呢？
And when his batteries run low, he behaves like an amusing drunk.
当他的电池没电的时候，他表现得像个有趣的醉汉。
Some parts of the United States have begun to run low on water.
美国一些地区已开始面临缺水困境。
I'm ordering office supplies. Is there anything that you're running low on?
我在订购办公用品。你有什么东西快用完需要补充的吗？
We had to return to camp because our food supply was running low.
我们不得不返回营地，因为我们带的食品快吃完了。
Food stocks are running low.
贮存的食物快吃完了。
Supplies are running low.
物资供应渐趋不足。
We are running low on drinking water.
我们的饮用水不多了。
We are running low on food.
现在食品供应紧张。
Stocks of ammunition were running low.
弹药的库存渐趋不足。
We broke off the action because our ammunition was running low.
我们停止了战斗，因为弹药快用尽了。
注意：run down含义是：用完，耗尽；消减；撞到；详细列举，详细介绍
The battery has run down.
电池用完了。
Run down a car/battery.
指车辆或电池中的能量逐渐减少或耗尽。
Run down one's energy/health.
耗尽某人的精力或损害某人的健康。
Its$ 25m reserve fund had been run down to around$ 8m.
其2,500万美元的储备金已被减少到了800万美元左右。
The property business could be sold or run down.
可售出或削减房地产业务。
Before the presentation, I’ll run down the main points we want to cover.
在演示之前，我会列出我们想要涵盖的重点。