2. It expresses a certain denotation as a whole, it is the language essence which was practiced
concisely and comprehensively.
成语以整体来表示一定的意义,它是经人们锤炼而成的言简意赅的语言精华。
3. It introduced
concisely a new structure of hemming die and provided a new resolvent for the combing the pressing processes of hemming edges of 45°and planishing.
简单介绍了一种新的折边模结构,为冲压工序中折45°边和压平两道工序的合并问题提供了一种新的解决方法。