variable frequency speed control technique的用法和樣例：
例句
- The maturing of variable frequency technology becomes an assurance for the reliable operation of a trolley type scraper.
變頻調速技術的成熟是滑線式鏟運機可靠工作的保證。 - The paper mainly introduces the technology of adjusting speed of convertor and its superiority.
主要介紹變頻器的調速技術及使用變頻器的優越性。
