The proposition of the feel for idioms and idiom degree, for solving the problem on "what idiom is ", will be helpful.
3
什么是成语呢?一个成语就是一组词,当结合在一起使用时,其意与单个词语所表达的意思均不一样。例如。
What is an idiom? An idiom is a group of words which, when used together, has a different meaning from the one which the individual words have. For example.