Warning: file_put_contents(/www/wwwroot/zidian/oumou.cn/cache/3c57ef6f3cef1843e453f986c6ed360d.txt): failed to open stream: No space left on device in /www/wwwroot/zidian/oumou.cn/index.php on line 58 spur-gear英英字典_spur-gear剑桥英语解释_spur-gear柯林斯英文解释_欧米惠必应词典
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