The Design of Automatic Testing System for Detecting the Flaws in Ring-shaped Welding Seam of Welded Powder Canister with Ultrasonic是什麼意思_The Design of Automatic Testing System for Detecting the Flaws in Ring-shaped Welding Seam of Welded Powder Canister with Ultrasonic在線翻譯_英語_讀音_用法_例句