Warning: file_put_contents(/www/wwwroot/ppbbu/4cd.cn/cache/4920f09c3742cd470a2f91f9206347c7.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/4cd.cn/index.php on line 55 effective f-number是什么意思，effective f-number的翻译，effective f-number音标、读音、用法和例句_沉淀汉英词典