Warning: file_put_contents(): Only 0 of 6198 bytes written, possibly out of free disk space in /home/www/wwwroot/zidian/69228.com/index.php on line 55 permanent set英英字典_permanent set剑桥英语解释_permanent set柯林斯英文解释_魏碑心思朗文词典
1. N the change in shape of a material that results when the load to which it is subjected causes the elastic limit to be exceeded and is then removed 永久變形[engineering]