非生存时间过期（.NONE）。

No time-to-live expiration (.NONE).

youdao

这个时间需要在存储时间过期的任何时刻时被刷新。

The time needs to be refreshed anytime the stored time is outdated.

youdao

如果事件在指定时间过期之前发生，则继续进行正常执行。

If the event does occur before the defined time has expired, then normal execution continues.

youdao

And one of them will be filmed, too, so that if you can't actually make any of the times not to worry, that video will go online sometime Tuesday in plenty of time for Friday's pset deadline.

其中一门课程也会被拍成录像，所以你们万一没有时间也不用担心,那个视频在周二会放到网上去,直到周五过期，这其中还是有充裕的时间的。

哈佛公开课 - 计算机科学课程节选