苦难岁月的英文：
dark days; evil days

参考例句：

The mother and daughter shared their life together, supporting each other through years of hardship.
母女俩相依为命度过了苦难的岁月。

dark是什么意思：
n. 黑暗，暗处，无知，模糊，暧昧
adj.（颜色）深的；（皮肤等）微黑的，邪恶的，坏的，无知的，蒙昧的

It was getting dark.
天色渐暗。

It was dark and eerie.
里面又漆黑又可怕。

That was a shot in the dark.
这支箭是瞎放的。

days是什么意思：
n. 一天；白昼，白天；工作日；时代，时期

Things go on day by day.
事情逐日进行着。

Day by day the situation is improving.
情况在一天天地好转。

Like this, day after day.
就这样，日复一日。

evil是什么意思：
adj. 邪恶的，有害的，讨厌的
n. 罪恶，弊端

"Evil gotten, evil spent"
悖入悖出

To render good for evil
以德报怨

Poverty is the root of all evils
穷困是万恶之源