Warning: file_put_contents(/www/wwwroot/ppbbu/4cd.cn/cache/c4d79702a541f68abc56b2fcd410140c.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/4cd.cn/index.php on line 55 principal idempotent element是什么意思，principal idempotent element的翻译，principal idempotent element音标、读音、用法和例句_沉淀汉英词典