The aircraft of some companies thus have dual registration, which severely complicates control efforts.

Introduction With conventional structural materials, it has been difficult to achieve simultaneous improvement in multiple structural functions, but the increasing use of composite materials has been driven in part by the potential for such improvements.

It may be difficult to accurately determine the depth of a burn on a single examination and repeated examinations over a few days may be necessary.

The CD has until now not been affected by United Nations reform, and it seems difficult to agree on any reform in this Conference.

That's hard to say.

In the opinion of another Party, it is difficult to conduct a direct and clear assessment on the extent of implementation by both affected and developed country Parties due owing to the lack of concise criteria to review the implementation of the UNCCD.

As a result of these obstacles, it was hard to carry out small transactions before the invention of standardized and identical coins, and trade must have been largely confined to big deals between major parties.

It is difficult to translate a poem into another language.

It's hard to persuade Jonathan.

It is difficult to generalize.

Another limitation is the discrepancy between the survey samples used, which, in addition to preventing any useful breakdown of data to be made, can make it difficult to measure the results correctly.

The Chairperson said that the late submission of documents had implications for the Committee's work, as it was difficult to have a proper debate unless documentation was available in all relevant official languages.

While the full economic cost of cybercrime is difficult to measure accurately, it is clear that the cost to individuals, businesses and governments is not only substantial but rising.

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

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.

It was difficult to remove the coffee stain.

It's going to be difficult for us to do that.

It is difficult to disagree with the protesters.

Hard to be Easing

A particular attraction to criminals and terrorists is that record keeping is limited or in codes only understood by the operators themselves, making it difficult to reconstruct money trails in the event of an investigation.

But it s hard to break our habits, our adult habits.

It's difficult for them to understand that they're going to die.

One can hardly change one's point of view.

There are some things that are difficult to translate.

Now we get to the hard part.

The answer is not hard to find.

This is hard for Islamist parties to accept.

And seeing them makes it harder to deny their humanity.

It is difficult to make a credible forecast.

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.

Science and history also show this violent side of Mexican culture it is very hard to research Mesoamerican cultural history without stumbling on stories of genocide and human sacrifice.

Turkey s Balancing Act

Private sector lending became hard to mobilize, because there were many more creditors than in the bank dominated world of the 1980's, when negotiations could be conducted by just a few big players.

What do we learn from this example? It s hard to say.

From this perspective, adjustment is hard to beat.

It is hard to believe it is almost Christmas.

It is difficult to translate a poem into another language.

That claim was even more far fetched.

The reason is not hard to fathom.

Is it difficult to rebuild an identity via external context?

It was difficult for observers to judge its actual membership.