千辛万苦的英文：
[Literal Meaning]
thousand/hardship/ten thousand/hardship
tens of thousands of hardship

[解释]
很多艰难、苦难。

[Explanation]
innumerable hardships

[例子]
经过千辛万苦找到自己的亲生女儿后，这对夫妇决定自己抚养她。

[Example]
After finding her own daughter with innumerable hardships, the couple decided to raise her themselves.

[英文等价词]
thick and thin
innumerable trials and hardships

To say that you've come a long way is an understatement.
说你历经了千辛万苦一点也不为过。