Their marriage culminated their long friendship.是什么意思？

Their marriage culminated their long friendship.

他们交友多年, 有情人终成眷属。

their

pron. 他（她，它）们的，在提及性别不详的人时，用以代替 him 或 her；

例句
Their permissiveness toward their children reflects the wild abandon of their own lives.
他们对孩子的放任折射出他们自身生活的放浪形骸。

marriage

n. 结婚，婚姻生活，密切结合，合并；

例句
Rosie's idyllic world came to an abrupt end when her parents' marriage broke up...
父母婚姻的破裂使得罗茜田园诗般美好的世界陡然画上了句号。

culminated

v. 达到极点( culminate的过去式和过去分词 )；

例句
They had an argument, which culminated in Tom getting drunk...
他们争论了一番，最后汤姆喝醉了。

long

adj. 长的，长时间的，冗长的，过长的，长音的；adv. 长久地，始终，遥远地；n. 长时间，长时期，[语]长音节，（服装的）长尺寸，长裤；vi. 渴望，极想；

例句
As long as most people are happy to have the monarchy, the abolitionist position is an arrogant fantasy.
只要大多数人还乐意保留君主制，废除它的主张就是痴人说梦。

friendship

n. 友情，友谊，友善的关系，友善，好意；

例句
Nothing cements a friendship between countries so much as trade.
贸易最能增强国家间的友谊。