economic and practical的用法和樣例：
例句
- The modern education and the educational reform need to build up an economic and practical school network.
摘要規劃建設一個經濟實用的校園網，是學校教育現代化和教育改革的需要。 - An economical and practical detector in pentaerythritol production, its principle and application are introduced.
介紹季戊四醇生產中比較經濟實用的一種檢測裝置，對其原理和實際應用加以論述。
