run out 和run out of不一樣,run out 有“被用完”的意思,
如：The gas in the car ran out.
但是,run out of sth.是“用完.” 如果sth.做主語(yǔ),用被動(dòng)語(yǔ)態(tài),of 一樣不能省略,如：
I ran out of the gas.
The gas was run out of.