Sentence examples for remains difficult to determine from inspiring English sources

On the law-enforcement front, it remains difficult to determine exactly how many Al Qaeda operatives have been arrested or detained in the United States or abroad.

Judging by the banks' statement, I believe it remains difficult to determine whether these banks have really done anything to make credit more available to the small businesses that need it.

Yet, it remains difficult to determine how subsurface fluids are distributed in heterogeneous rock and soil formations, how fast they flow, how effectively they transport dissolved and suspended materials, and how they are affected by chemical and thermal exchange with the host formations.

Graft loss through rejection occurs as a result of alloimmunity or autoimmune recurrence; however, the latter remains difficult to determine.

It remains difficult to determine which patients will benefit from VA-ECMO and when this support will be futile.

However, due to the complexity inherent to many projects, it often remains difficult to determine the reasons for even obvious cases of overly optimistic project planning.

However, it remains difficult to experimentally determine the link between drug-targeted proteins and side effects in a large-scale datasets in a cost-effective and efficient manner (Whitebread et al., 2005).

Because leaf rank is determined subjectively, it remains difficult to be sure precisely what measurable characteristics of the vein network leaf rank describes.

Central sleep apnea remains difficult to treat and well designed, long-term controlled studies are needed to determine if any treatment prolongs survival.

It remains difficult to completely separate and untangle the interplay among race/ethnicity, SES, and tumor biology, and determine their respective roles in breast cancer outcomes.

So the choice remains difficult to explain.