Warning: file_put_contents(/www/wwwroot/zidian/oumou.cn/cache/39d2a9ce13fc5327d727032822260b3e.txt): failed to open stream: No space left on device in /www/wwwroot/zidian/oumou.cn/index.php on line 58 upper ball cover是什么意思，upper ball cover的翻译，upper ball cover音标、读音、用法和例句_欧米惠必应词典
The lower cover attached by the rolling ball and sleeved by the middle cover is connected with the internal screw of the upper cover through the external screw. 中套外周的上部制有外螺纹，中部制有上肩部，下部制有斜面； ip.com