Sentence examples for it difficult to trace from inspiring English sources

Surviving examples of the technique do not predate the 18th century, making it difficult to trace its earlier history.

The exogenous sequence of P1 is 16 nucleotides in size, and such a short fragment can be found in many species when a BLAST search was run to identify homologous sequence in GenBank, thus making it difficult to trace its origin.

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

Such hard-to-notice cases could make it difficult to trace the spread of the virus.

It bounces users' browsing activities around a large network of computers known as nodes making it difficult to trace.

A major challenge with sustainable procurement is that palm oil from different sources tends to get mixed together, making it difficult to trace back to the plantation.

But General Hendropriyono is convinced that terrorists here are now on the run.. "Jemaah Islamiyah is no longer intact," the general said, and the result is that "it is difficult to trace individuals one by one".

Although cabbage has an extensive history, it is difficult to trace its exact origins owing to the many varieties of leafy greens classified as "brassicas".

Bitcoin became popular, in part, due to it being difficult to trace transactions that use it.

It is difficult to trace the exact history of cabbage, but it was most likely domesticated somewhere in Europe before 1000 BC, although savoys were not developed until the 16th century.

Six months after the money was pledged, a total of $1.9 billion had not been delivered, while the organization said it was difficult to trace what had happened to the rest of it.