Sentence examples for been difficult to link from inspiring English sources
So far, however, it had been difficult to link the components of a potential Turing mechanism to the molecular constituents.
Moreover, it has been difficult to link documented variation in Middle Paleolithic artifact diversity or complexity to environmental factors [9], [10] or even hominin species.
In breast cancer, it has been difficult to link p53 mutation status to therapeutic response and clinical outcome, suggesting that additional factors may affect the p53 network.
However, it has been difficult to link abnormal PPI consistently with any clinical manifestation of schizophrenia, such as positive or negative symptoms or even cognitive deficits [ 25].
Nevertheless, it has been difficult to link the GWAS findings with mechanisms of AD precisely, in part because current GWAS technology does not identify the actual genetic changes that are responsible for altered risk (reviewed in [ 26, 27]).
It has been difficult to link the microevolutionary forces studied in contemporary populations to inferences about historical phenotypic selection (Grant and Grant 2002), yet this task is central to evolutionary biology (Rieseberg et al. 2002).
Some precursors have civilian uses and could be difficult to link to weapons without additional evidence.
Jennifer Estes, the 911 center director, says it is difficult to link a delayed ambulance to a death.
But the same research concludes that it's difficult to link human-driven warming to losses in recent mega-disasters.
For instance, whether the Federal Reserve will continue to keep interest rates low would be difficult to link to a particular company's prospects.
