新电脑在出厂前都要进行48小时的烧机测试。

New computers must go through a 48-hour ___burn-in process before leaving the factory.

为了避免屏幕残影，不要长时间把电脑桌面停留在同一个画面。

To prevent ___burn-in, avoid keeping your computer screen on the same static image for too long.

新兵在部队的前三个月会经历艰难的适应期。

New recruits go through a challenging ___burn-in period during their first three months in the army.