Warning: file_put_contents(/www/wwwroot/ppbbu/4cd.cn/cache/686c3ec2d3eae2748e04561605e7817a.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/4cd.cn/index.php on line 55 class period是什么意思,class period的翻译,class period音标、读音、用法和例句_沉淀汉英词典