Sentence examples for been difficult to test from inspiring English sources

However, this has been difficult to test directly.

But it's been difficult to test the hypothesis directly the way Dr. Bertness has.

But that idea had been difficult to test in real-world situations.

While this "germline codon" hypothesis is supported by various lines of evidence, it has been difficult to test.

However, it has been difficult to test whether this type of organization also exists in the auditory cortex, in part because there haven't been good models that can replicate human auditory behavior.

Typically, it has been difficult to test anxiogenic drugs in the elevated plus-maze due to the low baseline level of open arm exploration (10 20% open arm time) that is difficult to reduce further.

Most of these hypotheses are difficult to test.

So it's difficult to test for Zika in patients hospitalized with Guillain-Barre symptoms.

It's difficult to test whether the replacement referees were any different than the regular crews.

It is a theory, and, like most theories about American society, it is difficult to test on the national level.

Because outbreaks are rare and sporadic, for instance, it would be difficult to test such treatments in clinical trials.