Sentence examples for main challenges is that from inspiring English sources

And one of the main challenges is that none of us is perfect, male or female!

Of the commercially available whole smoke exposure systems, one of the main challenges is that they dilute and deliver smoke in different ways, which often limits/restricts the cross-comparison of biological responses from these various platforms.

However, one of the main challenges is that this data is highly heterogenous, and cleaning and combining data from different databases is probably the bottle neck.

I think the main challenges was that the schedule was so tight because we were pretty low budget.

The main challenge is that the Canal & River Trust rules and regulations make life quite difficult for trading boaters.

For these equations, as with KPZ, the main challenge is that, at very small scales, the behavior of the solutions is very rough and irregular.

The main challenge is that many of the terms are broad concepts and follow human rather than machine conventions.

The main challenge is that it is not easy to construct an operator and, in turn, to get its solutions.

The main challenge is that the decision tree requires labeled training data and prior knowledge of the system.

The investigator's main challenge is that many different mechanisms can generate the dysfunction found within most diagnostic categories.

Yet, KelDoc's main challenge is that it needs to be faster than ZocDoc when it comes to taking over the European market.