Warning: file_put_contents(/www/wwwroot/ppbbu/cp667.com/cache/e92174223d018b9f49421b501a619a4c.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/cp667.com/index.php on line 55 spur gears英英字典_spur gears剑桥英语解释_spur gears柯林斯英文解释_淳朴汉英词典
1. N a gear having involuted teeth either straight or helically cut on a cylindrical surface. Two such gears are used to transmit power between parallel shafts 正齿轮