Scientists had difficulty pinpointing the precise cause of the deaths, for neither melamine nor cyanuric acid are thought to be particularly toxic by themselves.
And they had difficulty pinpointing blame on Monsignor Lynn — a single, midlevel official — when there was evidence that other, more senior church officials, starting with the cardinal at the time, were involved in efforts to hush up the scandal.
Despite the increase in winds the center of circulation remained very broad, with Reconnaissance Aircraft having difficulty pinpointing the center.
SearchDOGS will find missing genes, but if the majority of genes in a species are missing SearchDOGS will have difficulty pinpointing the locations of new genes relative to those already identified.
Non-coding DNA may also be the reason why linkage studies that consistently point to a chromosomal region (such as linkage to the short arm of chromosome 6 for reading disability) have had difficulty pinpointing the gene responsible for the linkage.
Although linkage analyses have met with some success (Houlihan et al. 2009; Dick et al. 2006; Luciano et al. 2006; Posthuma et al. 2005), these studies lack power to detect common variation and have difficulty pinpointing the variant of interest (Balding 2006).
Even that, though, had trouble pinpointing what freeganism is.
Simón has difficulty adjusting.
"Romelu has difficulty walking.
Frequent school-based tests in math, for example, can pinpoint which teachers are having difficulty getting certain concepts across; they can then learn different approaches from their more successful peers.
