Warning: file_put_contents(/www/wwwroot/ppbbu/4cd.cn/cache/992b86ae670f08b9f8b77665e7258ee8.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/4cd.cn/index.php on line 55 principal center of curvature是什么意思，principal center of curvature的翻译，principal center of curvature音标、读音、用法和例句_沉淀汉英词典