Warning: file_put_contents(/www/wwwroot/zidian/diubi.cn/cache/581d8f9d26b45f66c2cc56be4f51998a.txt): failed to open stream: No space left on device in /www/wwwroot/zidian/diubi.cn/index.php on line 59 dummy variable英英字典_dummy variable剑桥英语解释_dummy variable柯林斯英文解释_果味酸柯林斯词典
1. N a variable appearing in a mathematical expression that can be replaced by any arbitrary variable, not occurring in the expression, without affecting the value of the whole 啞變量