In practice, it has been usually difficult to locate them.

It's difficult to work out exactly what is reducing poverty.

The mines are therefore difficult to locate.

Now, of course, in a mosh pit it's hard to specify a destination.

It's hard to say. At least six months, perhaps a year.

Although the List currently includes numbers next to the names, those numbers change every time a new entry is made because the new name is inserted based upon alphabetical order.

In the murky world of the Internet, attackers are difficult to identify.

It is difficult to quantify the precise impact of ISIS' efforts to promote its mission and recruit new members.

Most of the agreements are still new, and it would be difficult to identify areas that need improvement.

For some other studies, identifying the current state of knowledge with any degree of certainty was found to be difficult.

However, it was difficult to determine the exact molecular weight and number of amino acids in a protein.

It has been difficult to locate them (all have changed residence), and to gather evidence.

It is difficult to determine what is naturally present and what is anthropogenic.

It will, however, be difficult to establish the equivalence between the lack of basic insecurity and human rights.

In practice, it could be very difficult to establish the exact time of resolution of a dispute.

While reaffirming the crucial importance of these norms, it is a trifle difficult to outline their current applicability.

In particular, a low rate of response from States makes it difficult to identify relevant trends.

The multidisciplinary nature of nuclear medicine makes it difficult for medical historians to determine the birthdate of nuclear medicine.

Such meetings aimed at identifying the best solutions to leave behind the difficult situation currently experienced by the Kingdom.

The causes and motives behind the unprecedentedly high levels of general violence have become increasingly difficult to pinpoint.

These publications are not for sale, and individual cost factors are difficult to quantify.

Now, unfortunately, there is a lot of new physics whose signature could be missing energy, so it will be hard to tell the difference.

It is not difficult to understand the relationship between population control as a target based programme and the type of contraceptive promoted.

It's clear that it's not easy to know which ballast to drop and which altitude to take.

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

With regard to emissions reductions, it was difficult to identify potential solutions owing to the absence of information on specific operations.

However, it seemed difficult today to define what the world could or should expect from the world Organization.

Mr. Sengupta noted that the multifaceted nature of pro poor policies made it difficult to establish clear responsibilities and specific violations of rights it was difficult to make states or institutions responsible for the non realization or rights.

The truth is that it is hard to identify any correlation between regulatory structure and success in heading off or responding to the financial crisis.

It can be difficult to construct a path to nuclear disarmament if we do not know more precisely what will be the end goal.

Without some appreciation of the crimes to be charged, investigators will find it difficult to establish rational limits to their inquiries.

The report noted that it was difficult to determine expected outputs for academic activities, and even more so to link such outputs with resources utilized (inputs).

Given this situation, it is very difficult to determine what goes on at the airports in Somalia, in particular with regard to the shipment of arms and weapons.

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.

Now, it's hard to do.

If it's hard, the harder it is the better.

That's hard to say.

It's hard to believe

He's hard to please.

He's hard to please!

Hard to believe.

It would be difficult to...

It's a little hard to breathe.

I's hard to believe.

It's hard to tell.