The idea is that,for example,where novices to ATC may see 12 data blocks on the PVD and find it difficult to make sense of the traffic,the experienced controller sees three groups of four aircraft sequenced in trail to various destinations.

• 例如，ATC的初学者在PVD只上看见12个数据块，但是很难搞清楚空中交通的具体情况，而有经验的管制员则看到的是以不同目的地排列的三组航空器，每组是4架。