Sentence examples for main problems remain from inspiring English sources

Two main problems remain.

This proposal has not yet been universally accepted, and 2 main problems remain: (1) to define the timing between the end of therapy and F-FDG PET/CT and (2) to define the cut-off above which a patient may be considered a responder [ 1].

However, two main recommendation problems remain unsolved yet, data sparsity and cold start.

But many problems remain.

Although the spreading mechanism of H5N1 has been studied from different perspectives, its main transmission agents and spread route problems remain unsolved.

Yet old problems remain.

But problems remain.

But serious problems remain.

The problems remain.

But big problems remain.

But significant problems remain.