Warning: file_put_contents(/www/wwwroot/ppbbu/28094.com/cache/49e17896af2ac57f726920f4bfaba997.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/28094.com/index.php on line 55 conservation of mass英英字典_conservation of mass剑桥英语解释_conservation of mass柯林斯英文解释_贰靶汉英词典
1. N the principle that the total mass of any isolated system is constant and is independent of any chemical and physical changes taking place within the system 质量守恒定律