practical加im前缀变否定，impractical 中文意思是“adj. 不明智的，不切实际的（人）无动手能力的，手不灵巧的”
Some of the traditional stories of neighborliness are impractical or silly and maybe just as well that our relations with our neighbors are changing.一些传统的睦邻友好的故事是不切实际或愚蠢的，也许我们与我们的邻居的关系正在改变。
practical加什么前缀变否定
英语中practical是practice的形容词，意思是切实可行的。他的否定前缀是im构成impractical。意思是不切实际的。
例如
Can you tell me the practical method to improve my study?
If you want to make much money without your hard work， it is impractical.
