Warning: file_put_contents(/www/wwwroot/ppbbu/www.30232.com/cache/f934c0a6eeaf2020a63c1d634a646eff.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/www.30232.com/index.php on line 55 control group英英字典_control group剑桥英语解释_control group柯林斯英文解释_绍翊字体网有道词典
1. N any group used as a control in a statistical experiment, esp a group of patients who receive either a placebo or a standard drug during an investigation of the effects of another drug on other patients 控制组