Jack gives Wilson a clearance code to access the video's digitalbackup.
杰克给了威尔逊一个准许代码，查找视频数码备份文件。
2
Most television stations will use backup antennas during the transition while their old analogue ones are taken down from their towers and replaced with new digital masts.
大多数电视台都会在转换过程中使用备用天线，从发射塔卸下老式的模拟天线，而代之以新的数字天线塔杆。
3
Be sure, of course, to burn backup copies of your digital photos onto archival DVDs.