Warning: file_put_contents(): Only 0 of 7282 bytes written, possibly out of free disk space in /home/www/wwwroot/ndsq.cn/index.php on line 55 ettectlve cross-section area of bolt是什么意思，ettectlve cross-section area of bolt的翻译，ettectlve cross-section area of bolt音标、读音、用法和例句_开心英文字典_柠咚词