Hmmm. This is a tough question.

嗯，这是一个很难回答的问题。

This is a tough question.

这是个很难的问题。

That "s a tough question to answer."

那是一个很难回答的问题。

The tough question is: why?

难题是：为什么？

Thats a tough question to answer.

那是一个很难回答的问题。

Thats a tough question to answer.

是一个很难回答的问题。

It's a very tough question.

这是个非常困难的问题。

That's a tough question to answer.

那是一个很难回答的问题。

This is a very tough question for me!

这是一个非常棘手的问题，我！

You need to ask yourself a tough question.

你必须问自己一个严肃的问题。

This is a tough question for me to ponder.

这还真是一个让人伤脑筋的问题。

Tough question it is, ladies and gentlemen.

女士们先生们这是一个难以回答的问题。

Now, here's the tough question: Are you doing it?

但是接下来难题也出现了：你现在所做的正是这件事么？

It's a tough question, because visitors don't tell you.

这是个难题，因为访客没有告诉你。

It is indeed a tough question for him: what is happiness?

这对他确实是很难回答的问题，什么是幸福呢？

It is a tough question for Mr Sarkozy, the EU's new boss, to answer.

对于萨科齐这位欧盟的新老板来说，这是一个需要回答的棘手的问题。

This is a really tough question. Can you help me with the answer?

这是一个特别难的问题，你能帮助我解答一下吗？

For nearly all economies, the tough question is on the supply side.

对几乎所有经济体来说，他们都面临着供应面的严峻考验。

That is a tough question to answer, whether you are a man or a woman.

不管你是男人还是女人，这都是个很难回答的问题。

That's a tough question to define exactly, and really it will take some experience.

很难准确回答，确实需要些经验。