Warning: file_put_contents(/www/wwwroot/ppbbu/80125.cn/cache/23f52d944a6af9127a2fc7a3dcbf85ba.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/80125.cn/index.php on line 58 line of force英英字典_line of force剑桥英语解释_line of force柯林斯英文解释_食材铺反向词典
1. N an imaginary line representing a field of force, such as an electric or magnetic field, such that the tangent at any point is the direction of the field vector at that point 力场的(虚构)线