Fortunately for John, he had an understanding wife.是什么意思？

Fortunately for John, he had an understanding wife.

幸运的是，约翰有一个通情达理的妻子。

fortunately

adv. 幸运地；

例句
The rain fortunately held off till after the school sports day.
幸亏雨直到学校运动会开过了才下.

for

prep. 为，为了，倾向于，关于，当作；conj. 因为，由于；

例句
I've come looking for a bit of advice.
我特来讨教。

John

n. 茅房，厕所；

例句
He was appointed Apostolic Administrator of Minsk by Pope John Paul II.
他被教皇约翰·保罗二世任命为明斯克区的宗座署理。

he

pron. 他，它，一个人；n. 雄性动物；

例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

an

art. 一（在元音字母前代替不定代词a），一任一某一，一个；

例句
He started eating an apple...
他开始吃苹果。

understanding

vt. 理解，懂得，熟知，通晓，获知，理解，谅解；vi. 理解，懂得，表示同情或谅解，据说；n. 认识，了解，谅解，知识；adj. 能谅解的，宽容的，通情达理的；

例句
...an investigation into children's understanding and appreciation of art...
就孩子对艺术的理解和欣赏所作的调查

wife

n. 妻子，太太，夫人，老婆，已婚妇女；

例句
His wife was sentenced to seven years imprisonment for aiding and abetting him...
他的妻子作为他的从犯被判入狱7年。