I will do my best to make my marriage a happy one. Although I may feel depressed and discouraged, I will spare no effort maintain a happy marriage.

我将尽我所能让我的婚姻变的幸福，尽管我对此有些愁苦与失意(作者意思是并不保持乐观的态度)，我将不遗余力地去维护一个幸福的婚姻。

youdao

I will do my best to make my marriage a happy one. Although I may feel depressed and discouraged, I will spare no effort maintain a happy marriage.

我将尽我所能让我的婚姻变的幸福，尽管我对此有些愁苦与失意(作者意思是并不保持乐观的态度)，我将不遗余力地去维护一个幸福的婚姻。

youdao