It's sometimes hard to imagine how bad things were in the thirties.

有的时候很难想像三十年代的情况有多糟。

《柯林斯英汉双解大词典》

Everyone understood how hard it was to get back into the swing of things after such a long absence.

每个人都明白离开这么长一段时间后要重新全力投入有多难。

《柯林斯英汉双解大词典》

It's hard to predict how things will turn out.

事情还不定怎样呢。

《新英汉大辞典》

If you go to the dining hall you know, the portions-- one person serves themselves this much of a food and another serves themselves another, and then when you go to a restaurant there are variations on how much you get served of things, and so it's very hard to estimate portions for people.

如果你去食堂,摄入量是指,一个人吃了自己的那部分食物,或其他人吃的他们的那一部分,当你去餐厅,每次吃多少是变化的,因此估算每个人的摄入量是很难的

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

But, look, I understand how hard things have been here.

WHITEHOUSE: President Obama Addresses Business and Tourism Leaders

If you step back and look -- how do you get hard things done when you have opposing sides?

WHITEHOUSE: Press Briefing

It's hard to see how things will change.

WSJ: Russia's Brain Drain