升级

　　A:We need to take the accounts system offline to carry out the upgrade. But don't worry, it won't cause too much inconvenience. We're going to do it over the weekend.

　　A:我们需要把这个报账系统下线进行升级但是别担心，不会带来太多不便的。我们在本周末进行升级。

　　B: How long will the system be down for?

　　B:这个系统多久能够下线？

　　A: We'll be taking everything offline in about two hours' time. It'll be down for a minimum of twelve hours. If everything goes according to plan, it should be up again by 6 pm on Saturday.

　　A:全部下线需要两个小时的时间。至少需要12小时才能弄完。如果一切都在计划之中，在星期六应该可以再次上线。

　　B:That's fine. We've allowed forty-eight hours to be on the safe side.

　　B:行。我们要求四十八小时安全可靠。