有一次,一个老师的孩子在做作业,有道难题问她妈妈。她妈妈也不会。后来看见我就象获救似地说:“快问问这个老师。”好象只有从我这里才能找到正确答案。我想小学习题有什么难,可是我接过一看,也道不出、说不清。怎样对孩子准确、完整地说出来呢?我只好承认:“我这个老师也不会了。”题目是这样的: Once, a teacher's child is doing homework and has a hard time asking her mother. Her mother will not. When I saw me later, it was as if rescued: “Ask the teacher as soon as possible.” It seems that only the correct answer can be found from me. I think what is the difficulty of primary school exercises, but I took a look, it is hard to tell, can not tell. How to say the child exactly and completely? I had to admit: “My teacher will not.” The subject is this: