Sentence examples for were difficult to determine from inspiring English sources

Exact profiles of PCB exposure were difficult to determine, since PCB transfer from breast feeding was not recorded.

The age, sex and race of the victim were difficult to determine, but the body appeared to be that of a young woman.

Exact casualty numbers from the bombings were difficult to determine because some people were thought to be crushed under collapsed buildings.

Terry Smith, a detective with the Monroe County Sheriff's Department, said the identities were difficult to determine because DNA from relatives in Cuba could not be obtained through official channels.

The focal mechanisms were difficult to determine.

The reasons for extubation failure were difficult to determine, but upper airway obstruction was documented as a contributing factor in 19% of failed extubations.

The answers are difficult to determine.

The truth was difficult to determine.

That has been difficult to determine".

But officials said the number would be difficult to determine.

It is difficult to determine what, precisely, the labs do.