Sentence examples for difficult to prove from from inspiring English sources

But there would be a greater risk "that nice middle-class people will have a drug problem in their family".True, it is difficult to prove from past episodes of drug liberalisation that such consequences would indeed occur.

While the inequality on the left in (1.6) is relatively simple to prove, the one on the right appears to be deeper and more difficult to prove from the perspective of [23].

With the exception of breast cancer (Richards et al, 1999), the linkage between delay and poor survival has been difficult to prove from observational studies.

Although to many people this sequence accords with common sense, with the exception of breast cancer (Richards et al, 1999), the linkage between delay and poor survival has been difficult to prove from observational studies.

The consequences of nuclear war on the environment, like its consequences on the balance of power, were difficult to prove; most data came from computer models, and from research on other planets.

Such weathering is difficult to prove in detail, but circumstantial evidence from South Australian sites suggests it contributes to the development of shore platforms, as well as to cliff-foot depressions and an assemblage of minor forms, such as basins, rock doughnuts, and fonts.

One of the problems with whiplash is that it can be difficult to prove whether someone is suffering from the condition or not.

Chinese government officials said they had not demanded that the relics be returned because, 140 years after the looting of the palace, it would be difficult to prove that they were taken from the country illegally.

It is admittedly difficult to prove that because parties access money from specific sources that there is a feed through into the policies they adopt.

It is difficult to prove that a worker's death from an occupational disease is a result of a particular employer's action or inaction.

However, these authors also cautioned that "it is difficult to prove direction of a clearance pathway from a static histological observation," which was the only evidence they had.