The most common example of a machine element is a gear, which, fundamentally, is a combination of the wheel and the lever to form a toothed wheel.是什么意思_The most common example of a machine element is a gear, which, fundamentally, is a combination of the wheel and the lever to form a toothed wheel.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句