带un-前缀的过去分词：
"That is an unfounded rumour." "No, it is an undoubted fact."
There are unnumbered (or untold) crimes in this small city.
The enemy suddenly attacked this unguarded city.
His unaffected (or unfeigned) manners make me love him.
A rich man has to hear unearned praise from time to time.
What is the most important thing for an underdeveloped country?
That is an unheard-of (=extraordinary) case of murder.
He bacame the owner of undreamt-of wealth.
An unlooked-for (=unexpected) love letter came to me this morning.
An unwished-for (or unhoped-for )(=undesirable ) accident happened to me.
Nobody can stand this uncalled-for (=unnecessary and improper) insult.
译路通武汉汉口翻译公司
2012.8.8