翻译一下大意

翻译一下大意

As they left Mr.Penbury peacefully reading in the park, Bill talked to Tom about the wanted man whose picture they had seen outside the police station.
　　“Tall, thin and with little hair,”he said.
　　“Mr.Penbury!”shouted Tom. “It fits him perfectly.”
　　“Exactly,”said Bill with both joy and excitement.
　　“But we know that our teacher isn't the wanted man,”said Tom.
　　“All the same, ”said Bill, pretending to be serious.“I think I ought to have a word with the police about this.”
　　Tom disagreed with his friend about the plan. But Bill made up his mind to revenge(报复)himself for all the punishments which Mr.Penbury had given him—unjustly in his opinion. He stopped at the next phone box and went in. He was smiling when he came out.
　　“Well, what did you say to them?”Tom asked.
　　“Oh, I just said that there was a man in the park, who looked very much like the wanted man.”
　　“But they must have known that it was a boy speaking,”Tom said.
　　“I don't think so,”Bill explained.“I changed my voice. I spoke like my father.”
　　The boys never found out for certain whether Mr.Penbury was actually arrested that Sunday. He appeared at school the next morning as usual. All the same, Tom felt that Bill's trick must have worked because he often caught Mr.Penbury studying their faces with even greater attention.

大意是两个学生Tom和Bill发现他们的老师Mr. Penbury长得像警察局门口张贴的通缉人物，于是Bill不顾Tom的反对打电话用假声音报了警，以报复以前老师对他的惩罚。
他们不知道老师有没有被抓，老师第二天照常出现在学校。不过Tom觉得Bill的玩笑起作用了，因为老师对他们俩盯得更紧了。

太模糊，看不清。发个清晰点的。