system upgrade

例句：

1. 1. The company has decided to upgrade its software system.
   该公司决定升级其软件系统。
2. 2.We need to update our systems regularly to ensure they are secure.
   我们需要定期更新我们的系统，以确保它们安全。
3. 3.The new system upgrade will improve the user experience significantly.
   新的系统升级将显著提高用户体验。