run away 和 run off 有什么区别?

un away
跑掉：
The thief had run away when the policemen came。
警察来时小偷已经跑了。
离家出走；私奔：
He left his home and ran away at the age of fifteen,and has never been heard of since。
他十五岁离家出走,至今杳无音信。
(液体)流掉；(钱)花掉：
There is a hole in my washbasin,and the water is running away。
我的脸盆上有一个洞,水都流走了。
run off
跑掉；迅速离开：
You must run off now。The rain is coming。
雨来了,你现在快走吧。
逃走；逃脱(责任等)：
Mike ran off when he heard that the police were hunting for him。
迈克听说警方正在搜捕他,就逃跑了。
使(比赛等)进行；比完：
The final of the 100 metres will be run off tomorrow。
百米决赛将于明天举行。
快速写出(或背诵出)：
He could run off an article in an hour。
他能在一小时内快速写出一篇文章。
印出；复印出；打印出：
We have to run off a few copies of the letter on the duplicating machine。
我们必须用复印机把这封信复印几份。
(使)流掉：
You must first run off the water from the tank。
首先必须把水从水槽中流掉。
驱逐,赶走：
We saw a hare jumping into our garden and ran it off。
我们看见一只野兔窜入花园里,便把它赶跑了。
偷偷赶走(牛、羊等)：
I heard someone running the cattle off last night。
昨天夜里我听见有人偷偷把牛赶跑了。