This investigation will help to determine the probable source of the infection.

It is therefore reasonable to conjecture that the 1926 film, Mons, was the most probable source.

Epidemiologists determined that health workers were the probable source of the spread.

At levels created from probable sources, not enough radiation would be present to cause severe illness or death.

We want the most probable source of the immortality drug.

Thus noisy data are the probable source of the discrepancy.

"The ship at the lower right of the screen is the probable source, Captain."

The most probable source of modification would be an interface with a living system.

The city imported ingots from probable sources in the Arabian peninsula.

Smith is one probable source for the quotation, "Writing is easy.