They were offered in thanksgiving or upon the successful completion of a vow.

在感恩节供奉,或者达成一个誓言的时候供奉。

耶鲁公开课 - 旧约导论课程节选

You have a freewill offering--just because someone wants to do this, a freewill offering. And you have a vow offering that would be offered on the successful completion of a vow, for example. And these sacrifices are all entirely optional.

自由祭品--只因为有人想这么干，自由祭品，还有一个誓言祭品,举个例子，一个誓言如果成功达成，便会供奉祭品，这些祭品都是可选择的。

耶鲁公开课 - 旧约导论课程节选