The services are mission critical for me and too important to mess up.

我处理的都是很关键的事情，万一搞砸就坏了。

Big companies will probably keep "mission critical" systems in-house.

大公司也许会将“关键业务”系统保留在公司内部。

This depends if the application needs support, for example for mission critical applications.

这取决于应用是否需要支持，比如任务关键的应用。

It is best placed at the point in your environment where user connectivity is mission critical.

最好将其安装在用户连接性是关键任务的环境中。

However this did not stop people from building very large, mission critical, systems - like the Cargill Lynx Project.

但是，这并不妨碍人们去构建大型的关键任务的系统，例如Cargill Lynx项目。