Sentence examples for it is difficult to test from inspiring English sources

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

And it is difficult to test two experimental drugs in combination because the regulatory system is geared to assessing a single drug at a time.

From the sparse details available, it is difficult to test the creators' claim that the free lessons are "as effective as professional e-learning packages such as Rosetta Stone with a price tag of $500".

It is difficult to test the validity of these assumptions in a real life situation.

In the case of GM crop plants it is difficult to test the relevance of anticipated risks on the same spatial scale as the intended use.

While it is difficult to test this relationship on a country level, it may be possible by looking at indicators of income inequality, e.g., GINI index.

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

But, Mr. Brown said, "It's difficult to test the law if you have to run the gantlet with these other potential charges".

The report said it was difficult to test the effect of actual levels of crime since reported crime data was "notoriously unreliable".

It's difficult to test that immediately, it seems like something you may start to notice over time as content comes in faster.

Of course, Bluetooth users choose headsets for reasons beyond call clarity, especially since it's difficult to test that feature in most stores.