Sentence examples for so difficult to determine from inspiring English sources

And Rep. Gerald E. Connolly (D-Va)., who praised Obama in a telephone interview after the speech for outlining "a very bold and decisive strategy," said the president's rebel-training request is "the toughest task and, I also think, the toughest of the goals to achieve" because it is so difficult to determine which rebels are trustworthy.

Why exactly is it so difficult to determine the number of people who do not talk about their invisible disability, such as ADHD, depression or chronic pain?

The constellation plan of the mission proposed two satellites at low altitude flying closely side-by-side with a small east-west separation; this configuration comprises essentially a gradiometer that should allow the determination of east-west gradients in the crustal field that are otherwise so difficult to determine.

Insomnia is often referred to as "vague" because it is so difficult to determine what exactly is causing the sleeplessness: underlying medical conditions, chronic pain, depression, or even another sleep disorder like restless leg syndrome.

Why is it so difficult to determine the incidence of maternal Toxoplasma infections in pregnancy in a country with a long-standing screening tradition?

Also, similar to our own findings, the relative impact of primary HPV testing was less robust to different versions of their model and so difficult to determine.

So it is difficult to determine whether police are making inroads or whether factories are simply scaling up production.

The voter polls do not give many clues about voters' motivation, so it is difficult to determine exactly why Republicans voted for either Mrs. Clinton or Mr. Obama.

North Korea is one of the most closed countries in the world, so it is difficult to determine what effect this could ultimately have on Mr. Kim's regime.

Pharmacology operates on a very slow timescale in comparison to the brain's millisecond-precision speed, and electrical stimulation affects many circuits, so it's difficult to determine the specific functions of different types of neurons using this approach.

It is assumed that the collection was partially processed while in storage at Evergreen, so it is difficult to determine the extent of original order.