Warning: file_put_contents(/www/wwwroot/ppbbu/62383.com/cache/f5a85e453201a3d209ecc0f8714ef824.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/62383.com/index.php on line 55 mathematics description and operational definition是什么意思，mathematics description and operational definition的翻译，mathematics description and operational definition音标、读音、用法和例句_流逝汉英词典