The courses last for four, six or eight weeks.

这个课程将有四个，六个或八个星期。

youdao

Immediately after hearing something, most of us can recall only 50% of what we hear. Within two to eight weeks, we can recall only 25% or less of the original message.

一听完某件事，大多数人只能记住其中之一的50%，两至八个星期内，我们只能记得原信息的25%，甚至更少。

youdao

Immediately after hearing something, most of us can recall only 50% of what we hear. Within two to eight weeks, we can recall only 25% or less of the original message.

一听完某件事，大多数人只能记住其中之一的50%，两至八个星期内，我们只能记得原信息的25%，甚至更少。

youdao