A " spree" (spree) is a short period of time or a fixed period of time when you do some activity with a lot of enthusiasm or with a lot of intensity.

“狂欢” （spree）是一段很短的时间或一段固定的时间， 当你以很大的热情或很大的强度做某项活动时。

There are companies and colleges that are trying out a new-fangled approach called Income Share Agreements in which the student agrees to pay a fixed percentage of their salary for a fixed period of time.

一些公司和大学正在尝试一种名为“收入分成协议”的新方法，即学生同意在固定期限内支付其工资的固定百分比。

And, so early do they catch a character, that the base of the moral character, experience leads me to infer, is fixed before their seventh year, the period during which women are allowed the sole management of children.

而且，他们很早就发现了一个品格，以至于我的经验使我推断，道德品格的基础在他们七岁之前就固定下来了，在此期间，妇女被允许单独管理孩子。