英语翻译The king of an unnamed country never tries his prisoners

英语翻译
The king of an unnamed country never tries his prisoners in a courtroom.He puts them to a test which he makes up himself.During a rebellion in the capital,three men were taken prisonal and were brought to the king.
This was the test.
He had the prisoners blindfolded and taken to a field where there were five poles,there white and two black.The poles were in a straight line from east to west.When the prisoners had been tied to the poles and the blidfolds removed,each prisoner could see only the pole(s)in front of him.
The king said,"If one of you can tell me the colour of the pole he is tied to,I will set all three of you free.If none of you can tell me,you will have to stay in prison for ten years.If any of you guessed wrong,you will all be shot.There are there white poles and two black ones.I will now ask each of you if he can tell me the colour of his pole.You may answer only ‘Yes’or‘No’or‘I don't know'.”
Prisoner X was tied to the middle pole.Prisoner Y to the pole next to X's and Prisoner Z next to Y's.The king asked X first,Y second and Z third.Each heard the other's answer.At last,each of them gave the proper answer and they were set free,as the king had promised.What did each prisoner answer when his turn came?

一个没有名字的国家里的国王从来不把他的犯人带入法庭.他让他们做一个他自己设计的测试.在一次城市的叛乱中,三个人被抓进了监狱并且被带到了国王那儿.
这是测试.
他将犯人的眼睛用眼罩蒙起来,并把他们带到一个旷野上,那里有五根柱子,三根白色两根黑色.五根柱子从西往东排成一条直线.当犯人被绑在柱子上后眼罩被拿走了,每个犯人只能看见他前面的那些柱子.
国王说：“如果你们中的一个能够告诉我他被绑着的这根柱子的颜色,我将会释放你们所有三个.如果你们中没有人能够告诉我,你们将会在监狱里呆十年.如果你们中的任何一个猜错了,你们会被枪毙.这有三根黑色的和两根白色的.我会问你们每一个人是否能告诉我他的那根柱子的颜色.你只能回答‘是’,‘不’或‘我不知道’”.
犯人X被绑在中间.犯人Y在X旁边且犯人Z在Y的旁边.国王首先问X,Y第二,Z第三.每个人都能听到其他人的回答.最后,他们每个人都给出了正确的回答并且他们都被释放了.当轮到他们回答时他们回答了什么?