请高手用英语解释一下这个短语,谢谢!

run out of ...
to use up or finish a supply of sth
e.g. We ran out of fuel.

其实英语中的搭配问题也是很重要的，这里搭配的规则其实就蕴含在此本身的意义里。而这些意义在经过汉语的替代词解释之后很可能丢失掉，所以造成我们的词或短语选用的不当。建议楼主在使用英汉词典的时候，注意看原来的英文解释，这样你会在最短的时间内抓住词的实际意思。当然也有很多不错的在线词典，比如Advanced Oxford Learners' Dictionary.
http://www.oup.com/elt/catalogue/teachersites/oald7/lookup?cc=global

I run out of gas.
我车子汽油用光了

seemed to have run out of gas
看来开始气力不继

I was scared we'd run out of gas.
我怕瓦斯告罄而提心吊胆

The explanation: there's no more gas left.

for example: I've run out of gas, so I need to have it refilled.