So it might be difficult to imagine anything twice as big.

VOA: special.2009.09.22

The first study, the one with the deceptive dolls with the big shoes and little shoes, is actually fairly difficult.

第一个研究用了有欺骗性的,穿着大鞋和小鞋的洋娃娃,实际上是非常难的

耶鲁公开课 - 心理学导论课程节选

So I think that it's true that the economy is difficult and there is big challenge in front of us.

所以我觉得，目前的经济形势真的很困难，我们面临着很大的挑战。

事业就是挑战 - SpeakingMax英语口语达人

Why don't we give Philip both the matching pair and give you each a pair of socks since he didn't get to wear this one, they are brand new, in fact, and a big round of applause for what I'm sure is a little difficult.

我们为什么不给飞利浦一双配对的袜子,给你们每人一双袜子,他还没穿这双袜子，所以这双还算是全新的，再次以热烈的掌声对他们表示感谢,这样的模仿还是有一些难度的。

哈佛公开课 - 计算机科学课程节选

Oh really? I imagine that it must be very difficult to drive in a big city like New York.

是吗？在大城市开车肯定会比较困难，比如在纽约。

Do you ever实战 - SpeakingMax英语口语达人

but because Los Angeles is so big and so spread out, it's kind of difficult.

但是因为洛杉矶太大，面积太广，这很难。

大众交通枢纽 - SpeakingMax英语口语达人