新年

Enny: Good morning, sir. I see you're looking at the Dinger. It's the latest model of computerized telephone.

： 您早。我见您正在注意这台Dinger电话，它是最新型的微电脑电话。

But it's difficult to choose the window of invalidation reports because parameters are varying with environments and time.

但由于不同的环境，不同的时段各种参数的变化，失效报告时间窗口ω的大小如何确定是一个难点。