Sentence examples for a puzzling issue from inspiring English sources

And this is still a puzzling issue for us.

At the highest energies, the sources and the mechanisms by which cosmic rays are generated and/or accelerated are still a puzzling issue for today's astrophysicists.

It is a puzzling issue found in the field of Supervisory Control and Data Acquisition (SCADA) to read automatically the indication of analog measuring instruments, which collects many states of power system equipment.

A puzzling issue remains what to call people going from their homelands to other countries, and under what conditions.

How such features changed during evolution remains a puzzling issue.

This finding pointed out a puzzling issue that the role of miR-233 may have substantial species difference and provided an explanation to the inconsistent results derived from human and mouse studies.

The presence of a poorly expressed class Ib enzyme in S. Typhimurium and Enterobacteriaceae in general has been a very puzzling issue since it was first described [32].

What might appear to be a puzzling result can be explained as a consequence of two issues.

Another puzzling issue is that a valuable percentage of patients, almost elderly, show more than one cause of dyspnea[5, 6].

Chromera velia has attracted much attention because it is a photosynthetic relative of apicomplexan parasites, whose highly reduced, non-photosynthetic plastid has been a puzzling evolutionary issue (Moore et al. 2008; Janouskovec et al. 2010; Obornik et al. 2011).

Although the split between archaea and eukaryotes occurred long before LECA, from 1.5 to 2.5 billion years depending on the methods used (Eme et al. 2014), this constitutes a puzzling evolutionary issue as to how the RP has adapted from a simple two-component structure in archaea (the homohexameric PAN and the Rpn8/Rpn11 ortholog in some species) to a 18-component complex in LECA.