The reasons are not hard to find.

Once formed, these spores are very hard to eradicate.

She said, It was a big hurdle just to get farmers to touch underneath the vulva.

Now, it's hard to do. It's hard to translate a fish form, because they're so beautiful perfect into a building or object like this.

Materials that are different, but only slightly so, such as the isotopes of uranium, are very difficult to separate.

This makes it most difficult to assess with accuracy whether any given situation is improving or worsening.

Measuring language usage It is very difficult to determine what are the most popular of modern programming languages.

It's the economy of moving these heavy, slow atoms over long distances that's very difficult to do.

Maryam Sheybani, a journalist who wrote for Ham Mihan, says it was very, very difficult to say good bye to our journal.

And it is so difficult to engage people in politics when they believe that what really matters is where they personally stand.

This means that the biases that lead investors to do badly, that lead to the foreclosure crisis are going to be really hard to overcome.

I tried to emulate him, but I realized it is very difficult to make good mistakes.

And without the ability to perceive pitch well, music and melody is a very difficult thing to do forget about a harmony and things like that.

One can only imagine how difficult and exhausting this can be for the already mentally strained, HIV AIDS afflicted person and the people around him.

While it is relatively easy to acquire modern technologies by paying appropriate fees and costs, it is very difficult to maintain them without related service providers.

If the girl was Madeleine she couldn t have gone unnoticed as it is too early for her to speak the local language fluently without reverting to English.

In general, neuroregeneration can occur in the peripheral nervous system but is much rarer and more difficult to assist in the central nervous system (brain or spinal cord).

Did you pay for the book?

I paid him five dollars.

She paid the dressmaker for her dress.

Layla paid Sami.

The chains pointed to other market forces which, they said, caused them to increase these prices.

When you combine these actions with those of members of the police force carrying out killings outside their own code of conduct it is often very difficult to identify exactly who is responsible.

That's hard to say.

It cost me 3,000 yen to buy the record.

Layla pushed Sami to the wall.

The 2004 European Union (EU) enlargement stimulated useful exchanges of information but full harmonization was considered difficult.

And that was a very, very, very big part of my process.

Because it's going to be very difficult for them to dissent knowing that 24 hours after this is going to be on the public space, and this is in a certain way going to be a political crisis.

It is difficult to translate a poem into another language.

It's hard to persuade Jonathan.

It is difficult to generalize.

I paid 1,500 yen for this dictionary.

Lastly, Australia, Poland and the United Republic of Tanzania had paid their assessments in full, which brought to 23 the number of countries that were fully up to date with their payments.

Against this background, it will undoubtedly be extremely difficult to create an international order that strikes the needed balance between legitimacy and power. To meet this challenge, three potential approaches stand out.

This problem is too difficult for me to solve.

We hardly ever see you around here.

It's hard being a parent.

Hard to believe, right?..

Yesterday was an indescribable day.

Nevertheless, we spend the vast majority of our energy focused on this level of the pyramid, trying to tackle things that are already completely adapted to human beings, that are going to be very very difficult to address as we've seen in the case of HIV.

The move prompted protests from human rights groups and forced the authorities to drop the charges.

Especially if you breathe air, it's very hard to get from planet A to planet B, because there's no air in between. But if you breathe air you're dead as soon as you're off the planet, unless you have a spaceship.

Until we get our hands on those fugitives it will be very difficult to predict the length of the mandate, unless we can foresee now that those individuals still at large may never be arrested, in which case it would be necessary to try them in absentia.

It was difficult to remove the coffee stain.