Economical significance的用法和樣例：
例句
- So it is economical to repair the crack of the cavity cover and reuse it.
對受損缸蓋進(jìn)行修復再利用是極其具有經(jīng)濟意義的。 - Then, give the economic significance and calculational methods of these four kinds calculational methods.
然后，重點(diǎn)介紹了四種類(lèi)型的技術(shù)進(jìn)步貢獻的經(jīng)濟意義及計算方法。
