Warning: file_put_contents(): Only 0 of 4868 bytes written, possibly out of free disk space in /www/wwwroot/ppbbu/cp667.com/index.php on line 55 free electron英英字典_free electron剑桥英语解释_free electron柯林斯英文解释_淳朴汉英词典
1. N any electron that is not attached to an ion, atom, or molecule and is free to move under the influence of an applied electric or magnetic field 自由电子