Warning: file_put_contents(/www/wwwroot/ppbbu/4cd.cn/cache/5df1e9f1663c31b176694a01fb6b2c91.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/4cd.cn/index.php on line 55 operational call sign是什么意思，operational call sign的翻译，operational call sign音标、读音、用法和例句_沉淀汉英词典