Sentence examples for particularly difficult to trace from inspiring English sources

The history of the fairy tale is particularly difficult to trace because only the literary forms can survive.

Thus, it is particularly difficult to trace a non-random pattern between topologies inferred from the two unlinked nuclear loci, nrITS and Xdh, that could exclude ILS as the possible explanation for incongruence [ 91, 92].

Retrotransposons seem particularly abundant in chaetognaths but current resources make it difficult to trace back their respective relationships and ancestry.

Senator John McCain's family tree proved more difficult to trace.

Getting inside, Mr. Chertoff said, is particularly important because many of the weapons are bought by middlemen at gun shows and shops and then resold or delivered to the cartels, making them difficult to trace.

Currently when a drone is captured it is difficult to trace back to an owner.

Among reported cases of E. coli, patterns are often difficult to trace to a single source.

The intellectual resources available to the creator of the Aladdin Ghoul are not difficult to trace.

And they always operate in ways that make it very difficult to trace back to them.

Its LeakFinderST technology pinpoints leaks in plastic pipes, which conventional sensors find it difficult to trace.

But it is difficult to trace authorship for the W.P.A. guides.