了解不同食物的“最佳食用日期”和“过期时间”，并正确烹调它们是很重要的。

It is important to know "best-before" and "use-by" dates of different foods and cooking them properly.

youdao

在默认情况下，过期时间设置为一小时。

The expiration time is set by default to one hour.

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时间戳和窗口一起来确定凭据的过期时间。

Together, the timestamp and the window determine the expiration time of the credential.

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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