They're difficult integrals.

Arabic is difficult!

Arabic is difficult!

Is Arabic difficult?

Innovation is difficult.

For without that, one difficult journey would be not merely difficult but close to impossible.

Islam is not difficult.

Obama s Difficult Fiscal Summer

Something difficult to explain.

Namgoong ... it is difficult.

This makes implementation difficult.

Such changes are difficult.

That is very difficult.

They use it to get to the truth, and they do what mature leaders do everyday they have difficult conversations with difficult people, sometimes during very difficult times.

Anyone? It's much more difficult.

It is a difficult problem.

It is a difficult problem.

At first, it is difficult.

Mathematics is difficult for me.

Hebrew is a difficult language.

Arabic isn't a difficult language.

Sami has a difficult life.

It is difficult to generalize.

This is a difficult call.

The equation was very difficult.

English is difficult, isn't it?

English is difficult, isn't it?

Doctors have a difficult problem.

They had a difficult job.

This mechanism makes it more difficult for governments to see traffic, and thus more difficult to block it.

This word is difficult to pronounce.

This is too difficult for me.

This book is difficult to understand.

Is it so difficult to write?

Is French more difficult than English?

Sami had a very difficult life.

The Berber language is so difficult.

Algeria is an especially difficult case.

This reality is difficult to convey.

Of course, difficult choices lay ahead.

But difficult does not mean impossible.

But assessing quality improvements is difficult.

But that is difficult to do.

Land acquisition became progressively more difficult.

Spain is a more difficult case.