It is hard to estimate how many children suffer from dyslexia.

很难估计有多少孩子有诵读困难。

《牛津词典》

It's hard to estimate the costs and benefits of making different choices.

很难估计出不同选择的成本和收益。

youdao

Its impact and influence is actually hard to estimate.

它带来的冲击和影响实在是难以估量的。

youdao

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

How hard did you find it to estimate how much you were eating of something?

你觉得估算自己,吃了多少量有多困难

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

In part because there's no treatment, the number of people afflicted is hard to estimate.

FORBES: Magazine Article

Climatologists across the world have been working hard to estimate and account for all these potential errors.

ECONOMIST: A heated controversy

But some kinds of damage, such as extinction, are beyond costing, and others are hard to estimate.

ECONOMIST: An invaluable environment