Is there some reason why this is difficult to demonstrate with DltC experimentally?
Federal authorities largely rely on local enforcement of the law, and non-enforcement is difficult to demonstrate.
It is difficult to demonstrate conclusively what impact these programs have on school performance, because of all the variables.
"Hard evidence for effects in humans is difficult to demonstrate, though there are some exceptions," he said.
Imprisoning parolees who commit technical violations is supposed to prevent future crimes, but the effectiveness of this strategy is difficult to demonstrate.
Applying to the court should be a last option because it is difficult to demonstrate evidence to suggest anything other than a joint tenancy and can be disproportionately expensive.
It is not just that it is difficult to demonstrate the immediate economic benefits of subjects such as neuroscience or pure mathematics, especially when compared with more immediately practical subjects such as moral philosophy or media studies.
However, this idea is difficult to demonstrate unambiguously in large, complex natural systems.
It is difficult to demonstrate both venous and arterial waveforms in all cases and torsion may be intermittent, demonstrating variability in detectable blood flow on color Doppler.
It is difficult to demonstrate if the plant can protect itself from environmental stress by using several antioxidant enzymes at a certain time.
However, the clinical efficacy of any modality of treatment is difficult to demonstrate since randomized, controlled clinical trials have not been reported.
