dropouts

raised the problem of dropouts with the faculty.

妙地提到退出的问题

Many of the town’s dropouts hang around the square.

这个镇的很多脫离社会传统的人在广场上闲荡。

That is, 30-hour chunks of data (which may span 40 hours of clock time due to dropouts) which require a search of a spindown parameter as well as sky position.

也就是30小时的大段数（由于含有无效信息可能会扩展到40小时），这与天区位置有关。